Reduce GPU precompile workloads

[cncastillo]

Summary

• restrict GPU precompile workloads to f32, Bloch, BlochMagnus2, and BlochMagnus4
• skip the CUDA precompile workload on Julia 1.10, where the persistent CUDA compiler cache is unavailable
• bump KomaMRICore to 0.12.5

Testing

• parsed all four edited extension files with Julia
• parsed KomaMRICore/Project.toml
• ran git diff --check

GPU CI is requested with the run-gpu-ci label.

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.38%. Comparing base (318bda9) to head (2d63286).

Files with missing lines	Patch %	Lines
KomaMRICore/ext/KomaCUDAExt.jl	5.26%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #932      +/-   ##
==========================================
- Coverage   91.46%   91.38%   -0.09%     
==========================================
  Files         137      137              
  Lines        7208     7255      +47     
==========================================
+ Hits         6593     6630      +37     
- Misses        615      625      +10     

Flag	Coverage Δ
base	90.76% <ø> (ø)
core	88.93% <14.28%> (-0.39%)	⬇️
files	95.15% <ø> (ø)
komamri	90.51% <ø> (ø)
plots	91.76% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
KomaMRICore/ext/KomaAMDGPUExt.jl	93.33% <100.00%> (+93.33%)	⬆️
KomaMRICore/ext/KomaoneAPIExt.jl	56.66% <100.00%> (+56.66%)	⬆️
KomaMRICore/ext/KomaCUDAExt.jl	36.36% <5.26%> (-54.27%)	⬇️

... and 10 files with indirect coverage changes

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