Seperate variables for alert and finding scheduled rollovers

[lezzago]

Signed-off-by: Ashish Agrawal ashisagr@amazon.com

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

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[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%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.