[Backport 2.x] acknowledge chained alert request for workflow

[opensearch-trigger-bot]

Backport fcb853e from #459

[codecov]

Codecov Report

Merging #460 (6e3efd8) into 2.x (53e10be) will increase coverage by 0.19%.
The diff coverage is 77.85%.

@@             Coverage Diff              @@
##                2.x     #460      +/-   ##
============================================
+ Coverage     71.14%   71.34%   +0.19%     
- Complexity      771      791      +20     
============================================
  Files           125      127       +2     
  Lines          5208     5342     +134     
  Branches        661      674      +13     
============================================
+ Hits           3705     3811     +106     
- Misses         1224     1241      +17     
- Partials        279      290      +11     

Impacted Files	Coverage Δ
...lin/org/opensearch/commons/alerting/model/Alert.kt	75.36% <71.05%> (+0.26%)	⬆️
...arch/commons/alerting/model/ChainedAlertTrigger.kt	75.34% <75.34%> (ø)
.../org/opensearch/commons/alerting/model/Workflow.kt	81.29% <86.95%> (+0.54%)	⬆️
.../alerting/action/AcknowledgeChainedAlertRequest.kt	91.66% <91.66%> (ø)
...n/org/opensearch/commons/alerting/model/Trigger.kt	86.95% <100.00%> (+1.24%)	⬆️