[Backport 2.17] Add Update QueryGroup API Logic (#14775)

[ruai0511]

Backport 2.17 Add Update QueryGroup API Logic (#14775)

[github-actions]

✅ Gradle check result for eaa2718: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 82.20339% with 42 lines in your changes missing coverage. Please review.

Project coverage is 71.64%. Comparing base (a3312b4) to head (eaa2718).
Report is 2 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
.../org/opensearch/wlm/MutableQueryGroupFragment.java	87.50%	7 Missing and 5 partials ⚠️
...ch/plugin/wlm/rest/RestUpdateQueryGroupAction.java	0.00%	8 Missing ⚠️
...in/wlm/action/TransportUpdateQueryGroupAction.java	0.00%	5 Missing ⚠️
...va/org/opensearch/cluster/metadata/QueryGroup.java	86.48%	2 Missing and 3 partials ⚠️
...rch/plugin/wlm/action/UpdateQueryGroupRequest.java	73.33%	4 Missing ⚠️
...ugin/wlm/service/QueryGroupPersistenceService.java	92.85%	2 Missing and 2 partials ⚠️
...arch/plugin/wlm/action/UpdateQueryGroupAction.java	0.00%	3 Missing ⚠️
...pensearch/plugin/wlm/WorkloadManagementPlugin.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.17   #15707      +/-   ##
============================================
- Coverage     71.70%   71.64%   -0.06%     
- Complexity    64192    64257      +65     
============================================
  Files          5251     5257       +6     
  Lines        300493   300650     +157     
  Branches      43728    43738      +10     
============================================
- Hits         215465   215398      -67     
- Misses        66974    67211     +237     
+ Partials      18054    18041      -13     

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