add unit test for JsonAsyncHttpPinotClientTransport

[sullis]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.70%. Comparing base (59551e4) to head (492fb45).
Report is 118 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #12633       +/-   ##
=============================================
- Coverage     61.75%   27.70%   -34.05%     
+ Complexity      207      198        -9     
=============================================
  Files          2436     2453       +17     
  Lines        133233   133831      +598     
  Branches      20636    20754      +118     
=============================================
- Hits          82274    37079    -45195     
- Misses        44911    93921    +49010     
+ Partials       6048     2831     -3217     

Flag	Coverage Δ
custom-integration1	<0.01% <ø> (-0.01%)	⬇️
integration	<0.01% <ø> (-0.01%)	⬇️
integration1	<0.01% <ø> (-0.01%)	⬇️
integration2	?
java-11	27.70% <ø> (-34.01%)	⬇️
java-21	27.69% <ø> (-33.94%)	⬇️
skip-bytebuffers-false	27.70% <ø> (-34.05%)	⬇️
skip-bytebuffers-true	27.68% <ø> (-0.04%)	⬇️
temurin	27.70% <ø> (-34.05%)	⬇️
unittests	27.70% <ø> (-34.05%)	⬇️
unittests1	?
unittests2	27.70% <ø> (-0.04%)	⬇️

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[sullis]

ready for review