[validations] Fix stable cuda validation for pypi release. Cleanup unused code.

[atalman]

1. Fixed an issue in tools/scripts/generate_binary_build_matrix.py hardcoded 12.4 value. Use STABLE_CUDA_VERSIONS instead
2. remove special cases validate pypi. Since pypi should be validated using default workflow.
3. Fixed poetry validations

[vercel]

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[malfet]

Ok, though poetry testing might not be a fully functional, but it's better to have some testing rather than nothing

[atalman]

Sounds good @malfet let me fix the poetry test. We should try to execute it on the nightly and test channels before release. Maybe as an option