Copies python binaries instead of symlink for more isolated venv

[nick-stroud]

This prevents changes to the system python from affecting our virtual environment.

Tested:

• Built image using this pr and ran ansible using the built image.
• I also observed under some conditions this avoided the venv from being corrupted when system python changed.

Note: This did not resolve the issue I have observed with the selinux python library when building Slurm on Rocky8.

Submission Checklist

Please take the following actions before submitting this pull request.

• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cloud HPC Toolkit Contribution guidelines #

[tpdownes]

I feel like this merits at least one successful integration test despite superficially being harmless.

[nick-stroud]

I feel like this merits at least one successful integration test despite superficially being harmless.

Running PR-test-hcls, PR-test-lustre-vm, and PR-test-packer to get some coverage.