Adds 2.16 release notes (opensearch-project#2061)

Signed-off-by: Darshit Chanpura <[email protected]>

release-notes/opensearch-security-dashboards-plugin.release-notes-2.16.0.0.md

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+## Version 2.16.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards version 2.16.0
+
+### Enhancements
+* [MDS] Adds datasource filter for version decoupling ([#2051](https://github.com/opensearch-project/security-dashboards-plugin/pull/2051))
+* Update nextUrl validation to incorporate serverBasePath ([#2048](https://github.com/opensearch-project/security-dashboards-plugin/pull/2048))
+* Conform to Navigation changes from OSD core ([#2022](https://github.com/opensearch-project/security-dashboards-plugin/pull/2022))
+* feat: http proxy support for oidc ([#2024](https://github.com/opensearch-project/security-dashboards-plugin/pull/2024))
+* Remove dependency on opensearch build repo libs from custom build.sh ([#2033](https://github.com/opensearch-project/security-dashboards-plugin/pull/2033))
+* Add custom build script to support different cypress version ([#2027](https://github.com/opensearch-project/security-dashboards-plugin/pull/2027))
+
+### Bug Fixes
+* Fix the bug of capabilities request not supporting carrying authinfo ([#2014](https://github.com/opensearch-project/security-dashboards-plugin/pull/2014))
+* Fix URL duplication issue ([#2004](https://github.com/opensearch-project/security-dashboards-plugin/pull/2004))
+
+### Maintenance
+* Format package.json ([#2060](https://github.com/opensearch-project/security-dashboards-plugin/pull/2060))
+* Addresses CVE-2024-4068 and updates yarn.lock ([#2039](https://github.com/opensearch-project/security-dashboards-plugin/pull/2039))