chore: update ci. remove connectors & summarize tests

[daniel-cohere]

This PR updates the TestNewClient function in the sdk_test.go file, replacing the base model with the command-a-03-2025 model in the TokenizeRequest and adding the same model to the DetokenizeRequest. It also removes the TestSummarize and TestConnectorCRUD test cases.

• The Model field in the TokenizeRequest is updated from "base" to "command-a-03-2025".
• A new Model field is added to the DetokenizeRequest with the value "command-a-03-2025".
• The TestSummarize test case is removed.
• The TestConnectorCRUD test case is removed.

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Note

Low Risk
Test-only changes that remove coverage for two endpoints and update a model string; no production logic is affected.

Overview
Updates the SDK integration tests by switching the tokenize/detokenize coverage to use command-a-03-2025 and explicitly passing the model for detokenization.

Removes the TestSummarize and TestConnectorCRUD subtests from tests/sdk_test.go, reducing CI reliance on endpoints that are flaky or hard to exercise in test runs (e.g., OAuth/connector lifecycle).

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