Add 2.12 release notes (opensearch-project#1408)

* Add 2.12 release notes

Signed-off-by: Chase Engelbrecht <[email protected]>

* Fix release notes PR

Signed-off-by: Chase Engelbrecht <[email protected]>

* Add 2 more PRs

Signed-off-by: Chase Engelbrecht <[email protected]>

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Signed-off-by: Chase Engelbrecht <[email protected]>

Author: engechas

release-notes/opensearch-alerting.release-notes-2.12.0.0.md

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+## Version 2.12.0.0 2024-02-06
+Compatible with OpenSearch 2.12.0
+
+### Maintenance
+* Increment version to 2.12.0-SNAPSHOT. ([#1239](https://github.com/opensearch-project/alerting/pull/1239))
+* Removed default admin credentials for alerting ([#1399](https://github.com/opensearch-project/alerting/pull/1399))
+* ipaddress lib upgrade as part of cve fix ([#1397](https://github.com/opensearch-project/alerting/pull/1397))
+
+### Bug Fixes
+* Don't attempt to parse workflow if it doesn't exist ([#1346](https://github.com/opensearch-project/alerting/pull/1346))
+* Set docData to empty string if actual is null ([#1325](https://github.com/opensearch-project/alerting/pull/1325))
+
+### Enhancements
+* Optimize doc-level monitor execution workflow for datastreams ([#1302](https://github.com/opensearch-project/alerting/pull/1302))
+* Inject namedWriteableRegistry during ser/deser of SearchMonitorAction ([#1382](https://github.com/opensearch-project/alerting/pull/1382))
+* Bulk index findings and sequentially invoke auto-correlations ([#1355](https://github.com/opensearch-project/alerting/pull/1355))
+* Implemented cross-cluster monitor support ([#1404](https://github.com/opensearch-project/alerting/pull/1404))
+
+### Refactoring
+* Reference get monitor and search monitor action / request / responses from common-utils ([#1315](https://github.com/opensearch-project/alerting/pull/1315))
+
+### Infrastructure
+* Fix workflow security tests. ([#1310](https://github.com/opensearch-project/alerting/pull/1310))
+* Upgrade to Gradle 8.5 ([#1369](https://github.com/opensearch-project/alerting/pull/1369))
+
+### Documentation
+* Added 2.12 release notes ([#1408](https://github.com/opensearch-project/alerting/pull/1408))