Revert "fix(general): using asteval instead of using eval (#7116)"

[thentenaar]

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Description

This reverts commit 5ddad08.

If the requisite Python upgrade isn't feasible, it makes sense to revert the asteval change, and go back to eval until it can be upgraded to a version not vulnerable to CVE-2025-24359; allowing folks an upgrade path who otherwise couldn't due to the CVE. Once everything's in place, the commit herein can be reverted.

Fixes #7194

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes