2.19.1 release notes added (#1804) (#1806)

(cherry picked from commit 7cc5a64)

Signed-off-by: Riya Saxena <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

release-notes/opensearch-alerting.release-notes-2.19.1.0.md

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+## Version 2.19.1.0 2025-02-27
+
+Compatible with OpenSearch 2.19.1
+
+### Maintenance
+* Increment version to 2.19.1-SNAPSHOT ([#1797](https://github.com/opensearch-project/common-utils/pull/1797))
+* Upgrade logback to 1.5.16 ([#1802](https://github.com/opensearch-project/common-utils/pull/1802))
+
+### Documentation
+* Added 2.19.1.0 release notes. ([#804](https://github.com/opensearch-project/common-utils/pull/1804))