Optimise getPartitionGroupConsumptionStatusList in RVM

[noob-se7en]

• Optimizes fetchPartitionGroupIdToSmallestOffset in PinotLLCRealtimeSegmentManager to reuse the already-computed latestSegmentZKMetadataMap instead of calling getPartitionGroupConsumptionStatusList,
  which performs a redundant O(N) scan over all IdealState segments and N additional ZK reads.
• getPartitionGroupConsumptionStatusList redundant calls was also repeated per stream config.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.20%. Comparing base (4ef8e3e) to head (bdda030).
⚠️ Report is 27 commits behind head on master.

Files with missing lines	Patch %	Lines
.../core/realtime/PinotLLCRealtimeSegmentManager.java	50.00%	18 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17712      +/-   ##
============================================
- Coverage     63.25%   63.20%   -0.05%     
- Complexity     1499     1501       +2     
============================================
  Files          3174     3179       +5     
  Lines        190323   190745     +422     
  Branches      29080    29159      +79     
============================================
+ Hits         120381   120563     +182     
- Misses        60606    60804     +198     
- Partials       9336     9378      +42     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	63.16% <50.00%> (-0.05%)	⬇️
java-21	63.18% <50.00%> (-0.04%)	⬇️
temurin	63.20% <50.00%> (-0.05%)	⬇️
unittests	63.20% <50.00%> (-0.05%)	⬇️
unittests1	55.62% <ø> (-0.01%)	⬇️
unittests2	34.05% <50.00%> (-0.03%)	⬇️

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