Backport 1097, 1302, 1435, 1441, 1445, 1430

[engechas]

Description of changes:

• Cherry-pick change to use zipArchive for notifications
• Update BWC tests to use same structure/arguments as main
• Update BWC version to 2.3.0
• Backport #1097, #1302, #1435, #1441, #1445, #1430

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[bot]]

Codecov Report

Attention: Patch coverage is 82.40575% with 98 lines in your changes are missing coverage. Please review.

Project coverage is 76.22%. Comparing base (5f738e3) to head (be34ced). Report is 10 commits behind head on 2.5.

Files	Patch %	Lines
.../opensearch/alerting/DocumentLevelMonitorRunner.kt	80.20%	36 Missing and 23 partials :warning:
...opensearch/alerting/util/DocLevelMonitorQueries.kt	84.84%	7 Missing and 18 partials :warning:
.../org/opensearch/alerting/MonitorMetadataService.kt	37.50%	0 Missing and 5 partials :warning:
.../kotlin/org/opensearch/alerting/util/IndexUtils.kt	72.22%	1 Missing and 4 partials :warning:
...in/org/opensearch/alerting/MonitorRunnerService.kt	89.47%	2 Missing :warning:
.../alerting/transport/TransportIndexMonitorAction.kt	66.66%	0 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.5 #1470 +/- ## ============================================ + Coverage 75.76% 76.22% +0.45% Complexity 116 116 ============================================ Files 125 125 Lines 6851 7320 +469 Branches 1028 1104 +76 ============================================ + Hits 5191 5580 +389 - Misses 1132 1178 +46 - Partials 528 562 +34 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.