scan_log_for_errors: check that regex is correct

[bayandin]

Problem

I've noticed that we have 2 flaky tests which failed with error:

re.error: missing ), unterminated subpattern at position 21

• test_timeline_archival_chaos — has been fixed in db743a8
• test_sharded_tad_interleaved_after_partial_success — I didn't manage to find the incorrect regex
  • an example
  • another example

Internal link

Summary of changes

• Wrap re.match in try..except block and print incorrect regex

[github-actions]

5517 tests run: 5291 passed, 0 failed, 226 skipped (full report)

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Code coverage* (full report)

• functions: 31.4% (7937 of 25247 functions)
• lines: 49.6% (62999 of 127010 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
2e3a763 at 2024-11-20T01:40:19.648Z :recycle:}