Skip corruption check on last WAL (#5596)

[ti-chi-bot]

This is an automated cherry-pick of #5596

What problem does this PR solve?

During EBS snapshot warmup, only check WALs up to the last one for corruption. We expect some corruptions in the last WAL due to race between fsync and EBS snapshot, and we can recover from these scenarios.

Also updates WAL log file pattern since logs can contain variable length log nos.

What is changed and how does it work?

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test

Executed warmup w/ these changes and observe warmup progress normally w/out checking the last WAL

• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[ti-chi-bot]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.54%. Comparing base (438a1ed) to head (89358e6).
Report is 1 commits behind head on release-1.5.

Additional details and impacted files

@@               Coverage Diff               @@
##           release-1.5    #5605      +/-   ##
===============================================
- Coverage        61.56%   61.54%   -0.02%     
===============================================
  Files              229      229              
  Lines            29330    29331       +1     
===============================================
- Hits             18056    18051       -5     
- Misses            9495     9498       +3     
- Partials          1779     1782       +3     

Flag	Coverage Δ
unittest	61.54% <ø> (-0.02%)	⬇️