fix(store/file): wait for q4 to be written before returning

[walldiss]

TLDR: It was possible to return with error before reading from channel. Which could lead to leak of q4 writing go-routine.

Fixed a race condition when writing/removing the Q4 file. The main go-routine wasn’t waiting for the Q4 write to finish, causing the file to be removed before the write completed. This could leave unpredictable data on disk after the removal. These changes ensure the write operation finishes before any removal is attempted.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 45.06%. Comparing base (2469e7a) to head (0491bb2).
Report is 349 commits behind head on main.

Files with missing lines	Patch %	Lines
store/file/ods_q4.go	30.00%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3865      +/-   ##
==========================================
+ Coverage   44.83%   45.06%   +0.22%     
==========================================
  Files         265      314      +49     
  Lines       14620    21804    +7184     
==========================================
+ Hits         6555     9825    +3270     
- Misses       7313    10955    +3642     
- Partials      752     1024     +272     

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[cristaloleg]

SGTM