[Deprecations] clear usage of deprecated package, function, and field

[brian-dellabetta]

SUMMARY:
Clear out some deprecation warnings in logs:

• Replace pynvml with nvidia-ml-py (which has the same API):

../../../../../opt/hostedtoolcache/Python/3.12.11/x64/lib/python3.12/site-packages/torch/cuda/__init__.py:63
  /opt/hostedtoolcache/Python/3.12.11/x64/lib/python3.12/site-packages/torch/cuda/__init__.py:63: FutureWarning: The pynvml package is deprecated. Please install nvidia-ml-py instead. If you did not install pynvml directly, please report this to the maintainers of the package that installed pynvml for you.
    import pynvml  # type: ignore[import]

• Replacesafe_permute(x,y, dim=d) with x.index_select(dim=d, index=y):

tests/llmcompressor/observers/test_min_max.py::test_g_idx
  /opt/hostedtoolcache/Python/3.12.11/x64/lib/python3.12/site-packages/llmcompressor/observers/base.py:172: DeprecationWarning: safe_permute is deprecated and will be removed in a future release. Please use Tensor.index_select instead.
    observed = safe_permute(observed, perm, dim=1)

• Only display warning for MagnituePruningModifier.leave_enabled if field has been set to something other than default value

  /opt/hostedtoolcache/Python/3.12.11/x64/lib/python3.12/site-packages/llmcompressor/modifiers/pruning/magnitude/base.py:43: DeprecationWarning: MagnitudePruningModifier.leave_enable has been deprecated
    warnings.warn(

TEST PLAN:
No net new src code, tests pass

[github-actions]

👋 Hi! Thank you for contributing to llm-compressor. Please add the ready label when the PR is ready for review.

Note: This is required to complete the testing suite, please only add the label once the PR is code complete and local testing has been performed.

[fynnsu]

Looks good! Don't forget to add ready label

[dhuangnm]

Ran nightly tests with the new dependencies and they look good.