feat: remove files from the write cache in purger

[evenyag]

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?

This PR removes files from the write cache explicitly once the purger removes the file.

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 45.16129% with 17 lines in your changes missing coverage. Please review.

Project coverage is 84.58%. Comparing base (a37aeb2) to head (4a9d0b0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4655      +/-   ##
==========================================
- Coverage   84.86%   84.58%   -0.28%     
==========================================
  Files        1105     1105              
  Lines      199051   199044       -7     
==========================================
- Hits       168915   168367     -548     
- Misses      30136    30677     +541