[Workload Management] Add Workload Management IT

[ruai0511]

Add Integration Tests for workload management
For more information regarding workload management, refer to this RFC: #12342.

This IT can be run using

./gradlew :server:internalClusterTest --tests org.opensearch.wlm.WorkloadManagementIT

[github-actions]

❌ Gradle check result for ecfe8c7: 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 1a550fe: 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 860e66e: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.00%. Comparing base (9dd1a59) to head (860e66e).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #16359      +/-   ##
============================================
- Coverage     72.06%   72.00%   -0.06%     
+ Complexity    65045    65007      -38     
============================================
  Files          5313     5313              
  Lines        303382   303382              
  Branches      43906    43906              
============================================
- Hits         218633   218465     -168     
- Misses        66855    66955     +100     
- Partials      17894    17962      +68     

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