Add test coverage for consuming segment using on-heap memory.

[mayankshriv]

Description

With PR #8380, we modified the default value for
pinot.server.instance.realtime.alloc.offheap to use off-heap. Explicitly setting
it to use on-heap in some of the integration tests for coverage.

Upgrade Notes

Does this PR prevent a zero down-time upgrade? (Assume upgrade order: Controller, Broker, Server, Minion)

• Yes (Please label as backward-incompat, and complete the section below on Release Notes)

Does this PR fix a zero-downtime upgrade introduced earlier?

• Yes (Please label this as backward-incompat, and complete the section below on Release Notes)

Does this PR otherwise need attention when creating release notes? Things to consider:

• New configuration options
• Deprecation of configurations
• Signature changes to public methods/interfaces
• New plugins added or old plugins removed

• Yes (Please label this PR as release-notes and complete the section on Release Notes)

Release Notes

Documentation

[mcvsubbu]

Can you add the appropriate labels for release notes please? thanks

[mayankshriv]

Can you add the appropriate labels for release notes please? thanks

The original PR that did the config value change has all the labels and release notes. This one is just making sure we have coverage for non-default.

[codecov-commenter]

Codecov Report

Merging #8385 (00239b0) into master (2d809ff) will decrease coverage by 31.96%.
The diff coverage is 70.96%.

❗ Current head 00239b0 differs from pull request most recent head 83f4b77. Consider uploading reports for the commit 83f4b77 to get more accurate results

@@              Coverage Diff              @@
##             master    #8385       +/-   ##
=============================================
- Coverage     69.75%   37.78%   -31.97%     
+ Complexity     4212       84     -4128     
=============================================
  Files          1653     1654        +1     
  Lines         86615    86452      -163     
  Branches      13080    13037       -43     
=============================================
- Hits          60420    32668    -27752     
- Misses        21966    51185    +29219     
+ Partials       4229     2599     -1630     

Flag	Coverage Δ
integration1	28.68% <13.97%> (+0.13%)	⬆️
integration2	27.15% <53.76%> (?)
unittests1	?
unittests2	14.13% <17.39%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
.../pinot/core/query/reduce/ResultReducerFactory.java	78.57% <ø> (+3.57%)	⬆️
.../java/org/apache/pinot/core/util/GapfillUtils.java	6.17% <0.00%> (-68.02%)	⬇️
...transform/function/IsNotNullTransformFunction.java	60.71% <60.71%> (ø)
...or/transform/function/IsNullTransformFunction.java	67.85% <67.85%> (ø)
...roker/routing/segmentpruner/TimeSegmentPruner.java	80.22% <75.00%> (-0.66%)	⬇️
...r/transform/function/TransformFunctionFactory.java	81.81% <80.00%> (-1.82%)	⬇️
...e/pinot/common/function/TransformFunctionType.java	84.52% <100.00%> (-15.48%)	⬇️
.../pinot/common/function/scalar/StringFunctions.java	18.46% <100.00%> (-54.56%)	⬇️
...ller/api/resources/PinotSchemaRestletResource.java	63.39% <100.00%> (+0.66%)	⬆️
...not/core/operator/transform/TransformOperator.java	83.33% <100.00%> (-10.22%)	⬇️
... and 993 more

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