release segment mgrs more reliably

[klsince]

Adjust the try-finally block a bit to release segment mgr more reliably to avoid leaking the refs of segment mgrs, which can block the segments to be released properly when it's dropped by retention mgr.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 62.17%. Comparing base (59551e4) to head (9e3390b).
Report is 490 commits behind head on master.

Files	Patch %	Lines
...che/pinot/server/api/resources/TablesResource.java	83.33%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13216      +/-   ##
============================================
+ Coverage     61.75%   62.17%   +0.42%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2533      +97     
  Lines        133233   138810    +5577     
  Branches      20636    21499     +863     
============================================
+ Hits          82274    86309    +4035     
- Misses        44911    46053    +1142     
- Partials       6048     6448     +400     

Flag	Coverage Δ
custom-integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration	<0.01% <0.00%> (-0.01%)	⬇️
integration1	<0.01% <0.00%> (-0.01%)	⬇️
integration2	0.00% <0.00%> (ø)
java-11	62.12% <83.33%> (+0.41%)	⬆️
java-21	62.06% <83.33%> (+0.43%)	⬆️
skip-bytebuffers-false	62.15% <83.33%> (+0.40%)	⬆️
skip-bytebuffers-true	62.02% <83.33%> (+34.29%)	⬆️
temurin	62.17% <83.33%> (+0.42%)	⬆️
unittests	62.17% <83.33%> (+0.42%)	⬆️
unittests1	46.66% <ø> (-0.23%)	⬇️
unittests2	27.86% <83.33%> (+0.13%)	⬆️

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[snleee]

LGTM!

Thank you for quickly improving this!