fix: [2.4] Release compaction task lock when return function

[xiaocai2333]

issue: #38851

master pr: #38856

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 70.35%. Comparing base (253860b) to head (f91913c).
Report is 1 commits behind head on 2.4.

Files with missing lines	Patch %	Lines
internal/datacoord/compaction.go	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.4   #38857      +/-   ##
==========================================
- Coverage   79.47%   70.35%   -9.13%     
==========================================
  Files        1077     1077              
  Lines      169559   169557       -2     
==========================================
- Hits       134754   119285   -15469     
- Misses      30321    45790   +15469     
+ Partials     4484     4482       -2     

Files with missing lines	Coverage Δ
internal/datacoord/compaction.go	74.59% <0.00%> (-1.89%)	⬇️

... and 264 files with indirect coverage changes

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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