fix: obsolete wal entires while opening a migrated region

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Delete obsolete wal entries while opening a migrated region

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 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.77%. Comparing base (0089cf1) to head (ad397a4).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4993      +/-   ##
==========================================
- Coverage   84.02%   83.77%   -0.25%     
==========================================
  Files        1144     1144              
  Lines      213480   213488       +8     
==========================================
- Hits       179369   178857     -512     
- Misses      34111    34631     +520     

[fengjiachun]

Rest LGTM