Backport 2.x - add auditDelegateMonitorAlerts flag (#476)

[eirsep]

Backports #476

• add auditDelegateMonitorAlerts flag

• add audit state check in error alert validation

• add test to verify workflow with auditDelegateMonitor flag null

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Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

Merging #477 (5b27aa9) into 2.x (1800974) will increase coverage by 0.60%.
The diff coverage is 88.88%.

@@             Coverage Diff              @@
##                2.x     #477      +/-   ##
============================================
+ Coverage     72.16%   72.77%   +0.60%     
- Complexity      829      837       +8     
============================================
  Files           129      129              
  Lines          5562     5575      +13     
  Branches        682      683       +1     
============================================
+ Hits           4014     4057      +43     
+ Misses         1252     1216      -36     
- Partials        296      302       +6     

Impacted Files	Coverage Δ
...lin/org/opensearch/commons/alerting/model/Alert.kt	73.55% <66.66%> (+0.06%)	⬆️
.../org/opensearch/commons/alerting/model/Workflow.kt	82.20% <90.90%> (+0.91%)	⬆️
...ommons/alerting/action/GetWorkflowAlertsRequest.kt	95.45% <100.00%> (+0.45%)	⬆️

... and 2 files with indirect coverage changes