[#11481] Fix DirectByteBuffer leak in ActiveThreadCount

[emeroad]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 21.62162% with 29 lines in your changes missing coverage. Please review.

Project coverage is 37.10%. Comparing base (15af83a) to head (8f6d852).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../receiver/grpc/PinpointClientResponseObserver.java	31.57%	13 Missing ⚠️
...er/receiver/grpc/GrpcActiveThreadCountService.java	0.00%	11 Missing ⚠️
...r/receiver/grpc/ActiveThreadCountStreamSocket.java	0.00%	4 Missing ⚠️
...oint/profiler/receiver/grpc/GrpcStreamService.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #11483   +/-   ##
=========================================
  Coverage     37.09%   37.10%           
- Complexity    12185    12189    +4     
=========================================
  Files          4015     4015           
  Lines         98600    98617   +17     
  Branches      10420    10422    +2     
=========================================
+ Hits          36580    36587    +7     
- Misses        59038    59048   +10     
  Partials       2982     2982           

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