adding release notes for 2.14 (#201) (#202)

Signed-off-by: Riya Saxena <riysaxen@amazon.com>

release-notes/opensearch-dashboards-notifications.release-notes-2.14.0.0.md

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+## Version 2.14.0.0 2024-04-29
+Compatible with OpenSearch Dashboards 2.14.0
+
+### Features/Enhancements
+* Added Multidata Source Support ([#197](https://github.com/opensearch-project/dashboards-notifications/pull/197))
+* Moved enrichment of server features to server side ([#181](https://github.com/opensearch-project/dashboards-notifications/pull/181)) ([#194](https://github.com/opensearch-project/dashboards-notifications/pull/194))
+
+### Maintenance
+* Add workflow to verify installation of the plugin zip and dashboards ([#165](https://github.com/opensearch-project/dashboards-notifications/pull/165))
+* Add AWSHurneyt as maintainer ([#177](https://github.com/opensearch-project/dashboards-notifications/pull/177))
+* Increment version to 2.14.0.0 ([#182](https://github.com/opensearch-project/dashboards-notifications/pull/182))
+
+
+### Bug fixes
+* Handle error state when dataSource switches to invalid dataSource ([#199](https://github.com/opensearch-project/dashboards-notifications/pull/199))
+* Fix broken osd functional test repo ([#189](https://github.com/opensearch-project/dashboards-notifications/pull/189))([#190](https://github.com/opensearch-project/dashboards-notifications/pull/190))
+
+### Documentation
+* 2.14 release notes. ([#201](https://github.com/opensearch-project/dashboards-notifications/pull/201))