[3006.x] Remove deprecated pyvenv and add venv support

[Akm0d]

What does this PR do?

What issues does this PR fix or reference?

Fixes #66132 Fixes #51742

Previous Behavior

The virtualenv module used the deprecated pyvenv library.

New Behavior

The virtualenv module uses the builtin venv library.

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• [x] Docs
• [x] Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• [x] Tests written/updated

Commits signed with GPG?

Yes

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