[main] Add release notes for 1.2.4

[davidcui1225]

Signed-off-by: David Cui [email protected]

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• 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.

[davidcui1225]

Closing this PR, will open another with dest. branch 1.2

[ps48]

@davidcui1225 thanks for the PR, we need to backport the release notes to main.

[codecov-commenter]

Codecov Report

Merging #274 (fed08aa) into main (fa3fa18) will increase coverage by 4.41%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #274      +/-   ##
============================================
+ Coverage     72.70%   77.11%   +4.41%     
============================================
  Files            94       30      -64     
  Lines          3924     1866    -2058     
  Branches        608      374     -234     
============================================
- Hits           2853     1439    -1414     
+ Misses          895      424     -471     
+ Partials        176        3     -173     

Flag	Coverage Δ
dashboards-reports	77.11% <ø> (ø)
reports-scheduler	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...heduler/resthandler/ReportDefinitionRestHandler.kt
...tsscheduler/action/CreateReportDefinitionAction.kt
...rtsscheduler/model/GetAllReportInstancesRequest.kt
.../reportsscheduler/model/ReportDefinitionDetails.kt
...rtsscheduler/model/OnDemandReportCreateResponse.kt
...reportsscheduler/action/ReportDefinitionActions.kt
...in/org/opensearch/reportsscheduler/util/Helpers.kt
...tsscheduler/scheduler/ReportDefinitionJobParser.kt
...tsscheduler/model/CreateReportDefinitionRequest.kt
...reportsscheduler/model/GetReportInstanceRequest.kt
... and 54 more

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