fix: avoid memoryleak in rendezvousFlushManager

[czs007]

issue: #33110

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Codecov Report

Attention: Patch coverage is 98.11321% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 83.08%. Comparing base (7a617e2) to head (d88e479).
Report is 1 commits behind head on 2.3.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.3   #33112      +/-   ##
==========================================
- Coverage   83.10%   83.08%   -0.02%     
==========================================
  Files         850      850              
  Lines      106653   106706      +53     
==========================================
+ Hits        88631    88657      +26     
- Misses      14725    14742      +17     
- Partials     3297     3307      +10     

Files	Coverage Δ
internal/datanode/data_sync_service.go	86.25% <100.00%> (+0.10%)	⬆️
pkg/util/paramtable/component_param.go	98.26% <100.00%> (+<0.01%)	⬆️
internal/datanode/flush_manager.go	92.59% <97.72%> (+0.43%)	⬆️

... and 16 files with indirect coverage changes

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