Add Integration Tests for Workload Management CRUD APIs

[ruai0511]

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

This IT can be run using

./gradlew ':plugins:workload-management:javaRestTest' \
  --tests "org.opensearch.rest.WorkloadManagementRestIT"

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for 4b0f7a0: 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 870aff0: 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 7f88472: 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?

[sandeshkr419]

I think we can refactor some request bodies with json utilities to make these tests more readable:

 public static String getCreateJson(String name, String resiliencyMode, double cpu, double memory) {
        return "{\n" +
            "    \"name\": \"" + name + "\",\n" +
            "    \"resiliency_mode\": \"" + resiliencyMode + "\",\n" +
            "    \"resource_limits\": {\n" +
            "        \"cpu\" : " + cpu + ",\n" +
            "        \"memory\" : " + memory + "\n" +
            "    }\n" +
            "}";
    }

    public static String getUpdateJson(String resiliencyMode, double cpu, double memory) {
        return "{\n" +
            "    \"resiliency_mode\": \"" + resiliencyMode + "\",\n" +
            "    \"resource_limits\": {\n" +
            "        \"cpu\" : " + cpu + ",\n" +
            "        \"memory\" : " + memory + "\n" +
            "    }\n" +
            "}";
    }

[github-actions]

❕ Gradle check result for f81637f: 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 71.87%. Comparing base (92d7fe8) to head (f81637f).
Report is 18 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15955      +/-   ##
============================================
- Coverage     71.90%   71.87%   -0.03%     
- Complexity    64216    64242      +26     
============================================
  Files          5272     5277       +5     
  Lines        300597   300691      +94     
  Branches      43440    43449       +9     
============================================
- Hits         216151   216133      -18     
- Misses        66680    66816     +136     
+ Partials      17766    17742      -24     

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