🧪 scripts: dl_cleanup: Add test for missing patchlevel IndexError in parseVer_123

[ManupaKDU]

🎯 What: The testing gap in scripts/dl_cleanup.py where the exception handling block for IndexError inside parseVer_123 (when match.group(5) fails) was entirely untested.

📊 Coverage: A new test class TestDlCleanupParseVer123 was added. It covers the scenario where a version string regex matches but lacks the 5th group (patchlevel), explicitly triggering the IndexError code path via a mocked regex match object.

✨ Result: Test coverage for scripts/dl_cleanup.py improved by ensuring the fallback logic assigning patchlevel = None and consequently evaluating patchlevel as 0 works correctly and safely without propagating exceptions.

Signed-off-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

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PR created automatically by Jules for task 5542137083509200070 started by @manupawickramasinghe

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