Added 2.19.1.0 release notes

Signed-off-by: Divya Madala <divyaasm@amazon.com>

Author: Divyaasm

release-notes/opensearch-common-utils.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 ([#792](https://github.com/opensearch-project/common-utils/pull/792))
+* Upgrade logback to 1.5.16 and Cron Utils to 9.1.8 ([#796](https://github.com/opensearch-project/common-utils/pull/796))
+
+### Documentation
+* Added 2.19.1.0 release notes. ([#780](https://github.com/opensearch-project/common-utils/pull/780))