avoid redundant record transforms

[klsince]

Avoid redundant record transforms, as those are already done during SegmentProcessorFramework.map() phase.

[codecov-commenter]

Codecov Report

Merging #8935 (2848dd0) into master (09fcdd5) will decrease coverage by 40.77%.
The diff coverage is 7.69%.

@@              Coverage Diff              @@
##             master    #8935       +/-   ##
=============================================
- Coverage     69.69%   28.92%   -40.78%     
+ Complexity     4630       47     -4583     
=============================================
  Files          1813     1801       -12     
  Lines         94521    94174      -347     
  Branches      14116    14079       -37     
=============================================
- Hits          65879    27237    -38642     
- Misses        24033    64397    +40364     
+ Partials       4609     2540     -2069     

Flag	Coverage Δ
integration1	26.76% <7.69%> (+0.11%)	⬆️
integration2	24.89% <7.69%> (+0.02%)	⬆️
unittests1	?
unittests2	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...l/realtime/converter/RealtimeSegmentConverter.java	0.00% <0.00%> (-80.71%)	⬇️
...creator/RecordReaderSegmentCreationDataSource.java	0.00% <0.00%> (-75.87%)	⬇️
...gment/local/segment/creator/TransformPipeline.java	0.00% <0.00%> (-91.43%)	⬇️
...t/creator/impl/SegmentIndexCreationDriverImpl.java	0.00% <0.00%> (-84.62%)	⬇️
...rocessing/framework/SegmentProcessorFramework.java	89.85% <100.00%> (-8.70%)	⬇️
...in/java/org/apache/pinot/spi/utils/StringUtil.java	0.00% <0.00%> (-100.00%)	⬇️
.../java/org/apache/pinot/spi/utils/BooleanUtils.java	0.00% <0.00%> (-100.00%)	⬇️
...java/org/apache/pinot/spi/trace/BaseRecording.java	0.00% <0.00%> (-100.00%)	⬇️
...java/org/apache/pinot/spi/trace/NoOpRecording.java	0.00% <0.00%> (-100.00%)	⬇️
...ava/org/apache/pinot/spi/config/table/FSTType.java	0.00% <0.00%> (-100.00%)	⬇️
... and 1248 more

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