[Tiered caching] Supporting removal function on EhcacheDiskCache iterator

[sgup432]

Description

Supports removal on ehcache disk cache key iterator.

Related Issues

Resolves #12652

Check List

• New functionality includes testing.
  • All tests pass
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• [ ] Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• [ ] Public documentation issue/PR created

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[sgup432]

@sohami Can you take a look at this one?

[github-actions]

Compatibility status:

Checks if related components are compatible with change 64d2f94

Incompatible components

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/flow-framework.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/opensearch-oci-object-storage.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/performance-analyzer.git]

[github-actions]

❌ Gradle check result for 65f14dc: FAILURE

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?

[github-actions]

✅ Gradle check result for 64d2f94: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.51%. Comparing base (b15cb0c) to head (64d2f94).
Report is 39 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12653      +/-   ##
============================================
+ Coverage     71.42%   71.51%   +0.09%     
- Complexity    59978    60076      +98     
============================================
  Files          4985     4985              
  Lines        282275   282305      +30     
  Branches      40946    40947       +1     
============================================
+ Hits         201603   201889     +286     
+ Misses        63999    63752     -247     
+ Partials      16673    16664       -9     

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