Ensure brokerId and requestId are always set in BrokerResponse

[Jackie-Jiang]

• Always attach brokerId and requestId, even for errored request
• Set numUnavailableSegments into RequestContext for multi-stage query

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.70588% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 62.23%. Comparing base (59551e4) to head (d9c8bab).
Report is 475 commits behind head on master.

Files	Patch %	Lines
...sthandler/BaseSingleStageBrokerRequestHandler.java	0.00%	3 Missing ⚠️
...requesthandler/MultiStageBrokerRequestHandler.java	0.00%	2 Missing ⚠️
.../org/apache/pinot/broker/querylog/QueryLogger.java	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #13200      +/-   ##
============================================
+ Coverage     61.75%   62.23%   +0.48%     
+ Complexity      207      198       -9     
============================================
  Files          2436     2529      +93     
  Lines        133233   138270    +5037     
  Branches      20636    21399     +763     
============================================
+ Hits          82274    86052    +3778     
- Misses        44911    45797     +886     
- Partials       6048     6421     +373     

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	62.20% <64.70%> (+0.49%)	⬆️
java-21	62.12% <64.70%> (+0.49%)	⬆️
skip-bytebuffers-false	62.22% <64.70%> (+0.47%)	⬆️
skip-bytebuffers-true	62.09% <64.70%> (+34.37%)	⬆️
temurin	62.23% <64.70%> (+0.48%)	⬆️
unittests	62.23% <64.70%> (+0.48%)	⬆️
unittests1	46.73% <ø> (-0.16%)	⬇️
unittests2	27.90% <64.70%> (+0.17%)	⬆️

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