feat: Reduce "changed" strings in output

[strugee]

Proposed changes

The impetus for this change is that having the string "changed" in the output makes it annoying to run check mode and then do a find for "changed" to figure out what a real run would modify.

Notice that, while the success_msg is no longer printed on success, the assertion failure formatting is still similar to what's printed before (though I would argue it's not great already... fail_msg doesn't really print right). IMO given the fact that Ansible prints task names, the success_msg isn't really adding much here, so this behavior seems ok.

Before:

[snipped]
TASK [nginxinc.nginx : Validate Ansible/Jinja2 version, Ansible collections, role variables, and supported distributions] ***************************************************
included: /var/home/alex/.ansible/roles/nginxinc.nginx/tasks/validate/validate.yml for dokku.host.seagl.org

TASK [nginxinc.nginx : Verify you are using a supported Ansible version on your Ansible host] *******************************************************************************
fatal: [dokku.host.seagl.org -> localhost]: FAILED! => {
    "assertion": "ansible_version['full'] is version('2.18', '<')",
    "changed": false,
    "evaluated_to": false,
    "msg": "(True | ternary('Ansible 2.18.11 is not yet supported. Please downgrade to a supported Ansible release', 'Ansible 2.18.11 has reached End of Life (EoL). Please upgrade to a supported Ansible release.') Check the README for more details."
}
...ignoring

TASK [nginxinc.nginx : Extract the version of Jinja2 installed on your Ansible host] ****************************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify that you are using a supported Jinja2 version on your Ansible host] ***************************************************************************
ok: [dokku.host.seagl.org -> localhost] => {
    "changed": false,
    "msg": "Jinja2 3.1.6 is supported."
}

TASK [nginxinc.nginx : Extract the list of Ansible collections installed on your Ansible host] ******************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify that the 'community.general' Ansible collection is installed on your Ansible host] ************************************************************
ok: [dokku.host.seagl.org -> localhost] => {
    "changed": false,
    "msg": "The 'community.general' Ansible collection is installed."
}

TASK [nginxinc.nginx : Verify that the 'ansible.posix' Ansible collection is installed on your Ansible host] ****************************************************************
skipping: [dokku.host.seagl.org]

TASK [nginxinc.nginx : Verify that the 'community.crypto' Ansible collection is installed on your Ansible host] *************************************************************
skipping: [dokku.host.seagl.org]

TASK [nginxinc.nginx : Verify that 'nginx_setup' parameter is a valid value] ************************************************************************************************
ok: [dokku.host.seagl.org -> localhost] => {
    "changed": false,
    "msg": "The value you used for 'nginx_setup', install, is valid."
}

TASK [nginxinc.nginx : Verify that 'nginx_branch' parameter is a valid value] ***********************************************************************************************
ok: [dokku.host.seagl.org -> localhost] => {
    "changed": false,
    "msg": "The value you used for 'nginx_branch', mainline, is valid."
}

TASK [nginxinc.nginx : Verify that 'nginx_install_from' parameter is a valid value] *****************************************************************************************
ok: [dokku.host.seagl.org -> localhost] => {
    "changed": false,
    "msg": "The value you used for 'nginx_install_from', nginx_repository is valid."
}

TASK [nginxinc.nginx : Verify whether you are using a supported NGINX distribution] *****************************************************************************************
ok: [dokku.host.seagl.org] => {
    "changed": false,
    "msg": "Your distribution, Ubuntu 24.04 (x86_64), is supported by NGINX Open Source."
}

TASK [nginxinc.nginx : Verify that you are installing a supported NGINX dynamic module] *************************************************************************************
skipping: [dokku.host.seagl.org]

[snipped]

After:

[snipped]
TASK [nginxinc.nginx : Validate Ansible/Jinja2 version, Ansible collections, role variables, and supported distributions] ***************************************************
included: /var/home/alex/.ansible/roles/nginxinc.nginx/tasks/validate/validate.yml for dokku.host.seagl.org

TASK [nginxinc.nginx : Verify you are using a supported Ansible version on your Ansible host] *******************************************************************************
fatal: [dokku.host.seagl.org -> localhost]: FAILED! => {"assertion": "ansible_version['full'] is version('2.18', '<')", "changed": false, "evaluated_to": false, "msg": "(True | ternary('Ansible 2.18.11 is not yet supported. Please downgrade to a supported Ansible release', 'Ansible 2.18.11 has reached End of Life (EoL). Please upgrade to a supported Ansible release.') Check the README for more details."}
...ignoring

TASK [nginxinc.nginx : Extract the version of Jinja2 installed on your Ansible host] ****************************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify that you are using a supported Jinja2 version on your Ansible host] ***************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Extract the list of Ansible collections installed on your Ansible host] ******************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify that the 'community.general' Ansible collection is installed on your Ansible host] ************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify that the 'ansible.posix' Ansible collection is installed on your Ansible host] ****************************************************************
skipping: [dokku.host.seagl.org]

TASK [nginxinc.nginx : Verify that the 'community.crypto' Ansible collection is installed on your Ansible host] *************************************************************
skipping: [dokku.host.seagl.org]

TASK [nginxinc.nginx : Verify that 'nginx_setup' parameter is a valid value] ************************************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify that 'nginx_branch' parameter is a valid value] ***********************************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify that 'nginx_install_from' parameter is a valid value] *****************************************************************************************
ok: [dokku.host.seagl.org -> localhost]

TASK [nginxinc.nginx : Verify whether you are using a supported NGINX distribution] *****************************************************************************************
ok: [dokku.host.seagl.org]

TASK [nginxinc.nginx : Verify that you are installing a supported NGINX dynamic module] *************************************************************************************
skipping: [dokku.host.seagl.org]

[snipped]

Additional notes

I didn't run Molecule locally because this seemed so trivial that I figured I'd let CI take that job. Also, I did not adjust CHANGELOG.md because I was confused, see #926. Happy to amend the patch though, to add a changelog entry.

Checklist

Before creating a PR, run through this checklist and mark each as complete:

• I have read the contributing guidelines.
• I have signed the F5 Contributor License Agreement (CLA).
• If applicable, I have added Molecule tests that prove my fix is effective or that my feature works.
• If applicable, I have checked that any relevant Molecule tests pass after adding my changes.
• I have updated any relevant documentation (defaults/main/*.yml, README.md and CHANGELOG.md).

[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
_{Posted by the CLA Assistant Lite bot.}

[strugee]

I have hereby read the F5 CLA and agree to its terms