[Backport 2.x] Add the capability to override indices.breaker.total.use_real_memory setting for test clusters

[opensearch-trigger-bot]

Backport 07029b2 from #15906.

[github-actions]

❌ Gradle check result for 634a20c: null

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[navneet1v]

@reta can you trigger the gradle check again?

[github-actions]

✅ Gradle check result for 634a20c: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.66%. Comparing base (008b3b9) to head (634a20c).
Report is 3 commits behind head on 2.x.

Files with missing lines	Patch %	Lines
...opensearch/gradle/testclusters/OpenSearchNode.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15930      +/-   ##
============================================
- Coverage     71.69%   71.66%   -0.04%     
- Complexity    64638    64692      +54     
============================================
  Files          5269     5269              
  Lines        302191   302191              
  Branches      43989    43989              
============================================
- Hits         216669   216568     -101     
- Misses        67449    67584     +135     
+ Partials      18073    18039      -34     

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