Add test coverage for compiled regex patterns in pytest.raises()

[vicky-dx]

Summary

This PR adds test coverage for using compiled regex patterns (re.Pattern objects) with the match parameter in pytest.raises(). While this functionality already works, it wasn't explicitly tested.

Changes

• Added test_raises_match_compiled_regex() in testing/python/raises.py
• Tests three scenarios:
  1. Compiled regex pattern that matches
  2. Compiled regex pattern that doesn't match (verifies error message)
  3. Compiled regex with flags (e.g., re.IGNORECASE)

Checklist

• Include new tests or update existing tests when applicable.
• Allow maintainers to push and squash when merging my commits.
• Create a new changelog file in the changelog folder (will add after PR number is assigned)
• Add yourself to AUTHORS in alphabetical order.

Notes

This is a test coverage improvement that ensures the existing functionality for compiled regex patterns remains stable in future releases.