Fix runtime lib loading logic

[ksivaman]

Description

This is a small refactor of library loading logic during runtime to be more consistent and avoid duplication. The main point is to check python packages as a last ditch attempt to find the library and prioritize system installations.

Fixes a bug where the incorrect shared object is loaded (with mismatching versions) due to presence of PyPI packages that are installed by pytorch/jax etc.

Type of change

• [ ] Documentation change (change only to the documentation, either a fix or a new content)
• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Infra/Build change
• [x] Code refactoring

Changes

• Remove duplication of loading logic for various libs such as curand, cudnn etc.
• Prioritize loading packages via system, e.g. LD_LIBRARY_PATH before checking python packages.
• Remove search via ldconfig as redundant and brute force.

Checklist:

• [x] I have read and followed the contributing guidelines
• [x] The functionality is complete
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[ksivaman]

/te-ci