Fix the test failures caused by instance drop failure

[Jackie-Jiang]

Fix #11329

PinotInstanceRestletResourceTest is flaky because instances are not cleaned up in PinotTenantRestletResourceTest

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7217bb9) 61.60% compared to head (0d45e0f) 46.83%.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #12002       +/-   ##
=============================================
- Coverage     61.60%   46.83%   -14.78%     
+ Complexity     1151      944      -207     
=============================================
  Files          2385     1787      -598     
  Lines        129250    93670    -35580     
  Branches      20007    15149     -4858     
=============================================
- Hits          79625    43870    -35755     
- Misses        43828    46693     +2865     
+ Partials       5797     3107     -2690     

Flag	Coverage Δ
custom-integration1	?
integration	?
integration1	?
integration2	?
java-11	?
java-21	46.83% <ø> (-14.66%)	⬇️
skip-bytebuffers-false	46.79% <ø> (-14.81%)	⬇️
skip-bytebuffers-true	46.78% <ø> (-14.69%)	⬇️
temurin	46.83% <ø> (-14.78%)	⬇️
unittests	46.83% <ø> (-14.77%)	⬇️
unittests1	46.83% <ø> (-0.11%)	⬇️
unittests2	?

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