Add 2.14 release notes (#915) (#916)

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

Author: opensearch-trigger-bot[bot]

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

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+## Version 2.14.0.0 2024-04-30
+
+Compatible with OpenSearch 2.14.0
+
+### Maintenance
+* Increment version to 2.14.0-SNAPSHOT (#[882](https://github.com/opensearch-project/notifications/pull/882))
+* Updates sample cert and admin keystore (#[862](https://github.com/opensearch-project/notifications/pull/862)) (#[885](https://github.com/opensearch-project/notifications/pull/885))
+* Updates sample cert and trust-store (#[899](https://github.com/opensearch-project/notifications/pull/899)) (#[912](https://github.com/opensearch-project/notifications/pull/912))
+
+### Bug Fixes
+* Adding max http response string length as a setting, and capping http response string based on that setting (#[876](https://github.com/opensearch-project/notifications/pull/876))
+* Adding Max HTTP Response Size IT (#[901](https://github.com/opensearch-project/notifications/pull/901)) (#[909](https://github.com/opensearch-project/notifications/pull/909))
+* Replacing spi.utils isHostInDenyList with core.utils isHostInDenyList (#[904](https://github.com/opensearch-project/notifications/pull/904)) (#[913](https://github.com/opensearch-project/notifications/pull/913))
+* Upgrade AWS version for SDKs to 1.12.687 (#[884](https://github.com/opensearch-project/notifications/pull/884)) (#[887](https://github.com/opensearch-project/notifications/pull/887))
+
+### Documentation
+* Add 2.14.0 release notes (#[915](https://github.com/opensearch-project/notifications/pull/915))
+