Resolves #1998

Summary

Add comprehensive unit tests for utils/logs/remove_pytest_sections.py targeting full coverage and explicitly exercising the previously uncovered branch around line 32.

Test Patterns

• Removes pytest sections when present while preserving surrounding non-pytest content (happy path).
• No pytest markers present: returns input unchanged (covers branch at ~line 32).
• Partial/malformed sections (only start or only end marker): handled gracefully without exceptions; behavior matches current implementation.
• Multiple pytest sections within one log: all sections removed.
• Overlapping/nested-like markers: boundaries respected; only intended ranges removed.
• Empty and whitespace-only inputs.
• Large input (stress) to ensure performance and no pathological behavior.
• Mixed newline styles (LF/CRLF) and mixed endings preserved appropriately.
• Logs containing ANSI color codes and Unicode characters: only pytest sections removed; other content intact.
• Invalid input types (e.g., None, bytes): raises the expected exception.

git fetch origin
git checkout gitauto/issue-1998-20251202-000525-iz2i
git pull origin gitauto/issue-1998-20251202-000525-iz2i