Remove HeapAlloc_rate as HotShardRCA's upstream node.

[Tjofil]

#362

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #411 (848bd6f) into main (515b35c) will decrease coverage by 0.13%.
The diff coverage is 50.00%.

❗ Current head 848bd6f differs from pull request most recent head 2ec1312. Consider uploading reports for the commit 2ec1312 to get more accurate results

@@             Coverage Diff              @@
##               main     #411      +/-   ##
============================================
- Coverage     76.08%   75.96%   -0.13%     
+ Complexity     2594     2580      -14     
============================================
  Files           302      302              
  Lines         15414    15357      -57     
  Branches       1216     1213       -3     
============================================
- Hits          11728    11666      -62     
- Misses         3191     3196       +5     
  Partials        495      495              

Impacted Files	Coverage Δ
...analyzer/rca/configs/HotShardClusterRcaConfig.java	75.00% <ø> (-1.93%)	⬇️
...ormanceanalyzer/rca/configs/HotShardRcaConfig.java	76.92% <ø> (-0.86%)	⬇️
...r/rca/framework/api/summaries/HotShardSummary.java	83.49% <0.00%> (-0.99%)	⬇️
...zer/rca/store/rca/hotshard/HotShardClusterRca.java	85.22% <0.00%> (-3.44%)	⬇️
...nceanalyzer/rca/store/OpenSearchAnalysisGraph.java	100.00% <100.00%> (ø)
...ceanalyzer/rca/store/rca/hotshard/HotShardRca.java	84.95% <100.00%> (+1.25%)	⬆️

... and 6 files with indirect coverage changes