Add v2.12.0 Release Notes

Signed-off-by: Rohit Ashiwal <rashiwal@amazon.com>

release-notes/opensearch-index-management-dashboards-plugin.release-notes-2.12.0.0.md

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+## Version 2.12.0.0 2023-02-07
+
+Compatible with OpenSearch-Dashboards 2.12.0
+
+### Maintenance
+
+* Remove unused integtest.sh file ([#954](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/954))
+* Increment version to 2.12.0.0 ([#928](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/928))
+* Update the babel require ([#935](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/935))
+
+### Enhancements
+
+* sort by managed policy feature ([#950](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/950))
+* Update background color in "state" block ([#903](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/903))
+* Rename indices to indexes ([#926](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/926))
+* adding cancel button to change policy ([#919](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/919))
+
+### Infrastructure
+
+* Onboard jenkins prod docker images to github actions ([#907](https://github.com/opensearch-project/index-management-dashboards-plugin/pull/907))