Backport bug fixes to 2.9

[eirsep]

Backports 2.x commits:
[Backport 2.x] Add logging for execution and indexes of monitors and workflows #1224
optimize doc-level monitor workflow for index patterns #1122
[Backport 2.x] fix for concurrentmodificationexception with linkedhashmap #1259

[codecov]

Codecov Report

Merging #1265 (bf946ce) into 2.9 (d0fcce4) will increase coverage by 0.31%.
The diff coverage is 90.43%.

@@             Coverage Diff              @@
##                2.9    #1265      +/-   ##
============================================
+ Coverage     67.96%   68.27%   +0.31%     
- Complexity      119      120       +1     
============================================
  Files           160      160              
  Lines         10582    10740     +158     
  Branches       1601     1628      +27     
============================================
+ Hits           7192     7333     +141     
- Misses         2682     2686       +4     
- Partials        708      721      +13     

Files	Coverage Δ
.../kotlin/org/opensearch/alerting/util/IndexUtils.kt	76.27% <ø> (-0.78%)	⬇️
...earch/alerting/workflow/CompositeWorkflowRunner.kt	72.01% <ø> (ø)
...alerting/transport/TransportIndexWorkflowAction.kt	54.94% <91.89%> (+3.93%)	⬆️
.../opensearch/alerting/DocumentLevelMonitorRunner.kt	84.75% <94.04%> (+1.46%)	⬆️
...opensearch/alerting/util/DocLevelMonitorQueries.kt	79.19% <87.69%> (+4.90%)	⬆️

... and 9 files with indirect coverage changes