Seperate variables for alert and finding scheduled rollovers

[lezzago]

Signed-off-by: Ashish Agrawal [email protected]

Issue #, if available:
#703
Description of changes:
Seperate variables for alert and finding scheduled rollovers to prevent both tasks to get cancelled

CheckList:
[X] Commits are signed per the DCO using --signoff

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[codecov-commenter]

Codecov Report

Merging #705 (91b6624) into main (9d9f588) will decrease coverage by 0.05%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##               main     #705      +/-   ##
============================================
- Coverage     76.35%   76.29%   -0.06%     
  Complexity      116      116              
============================================
  Files           124      124              
  Lines          6619     6620       +1     
  Branches        982      983       +1     
============================================
- Hits           5054     5051       -3     
- Misses         1066     1068       +2     
- Partials        499      501       +2     

Impacted Files	Coverage Δ
...lin/org/opensearch/alerting/alerts/AlertIndices.kt	73.85% <50.00%> (-0.31%)	⬇️
...ing/model/destination/DestinationContextFactory.kt	75.00% <0.00%> (-3.58%)	⬇️
...rch/alerting/opensearchapi/OpenSearchExtensions.kt	50.00% <0.00%> (-1.62%)	⬇️
...destinationmigration/DestinationConversionUtils.kt	71.11% <0.00%> (-1.12%)	⬇️
...nationmigration/DestinationMigrationUtilService.kt	81.45% <0.00%> (-0.81%)	⬇️
...ain/kotlin/org/opensearch/alerting/AlertService.kt	79.06% <0.00%> (+0.46%)	⬆️

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