fix(wal): handle WAL deletion on region drop

[v0y4g3r]

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Refer to a related PR or issue link (optional)

What's changed and what's your intention?

This PR handles WAL deletion when dropping regions.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.87%. Comparing base (0b13ac6) to head (4c82b74).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4400      +/-   ##
==========================================
- Coverage   85.16%   84.87%   -0.29%     
==========================================
  Files        1074     1074              
  Lines      192011   192040      +29     
==========================================
- Hits       163520   162995     -525     
- Misses      28491    29045     +554