added release notes for 2.12 release

Signed-off-by: sumukhswamy <[email protected]>

release-notes/opensearch-query-workbench.release-notes-2.12.0.0.md

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+## Version 2.12.0.0 Release Notes
+
+Compatible with OpenSearch and OpenSearch Dashboards 2.12.0
+
+### Features
+
+Add materlized views, manual refresh option https://github.com/opensearch-project/dashboards-query-workbench/pull/159
+Added changes for making tree view persistent https://github.com/opensearch-project/dashboards-query-workbench/pull/153
+Support dark mode and session for sql https://github.com/opensearch-project/dashboards-query-workbench/pull/165
+Update ppl editor readonly property https://github.com/opensearch-project/dashboards-query-workbench/pull/248
+Support for multiple datasource sessions https://github.com/opensearch-project/dashboards-query-workbench/pull/251
+
+### Bug Fixes
+
+fixed create table async query bug https://github.com/opensearch-project/dashboards-query-workbench/pull/158
+design changes for loading, changed the banner: https://github.com/opensearch-project/dashboards-query-workbench/pull/170
+Make checkpoint mandatory, add watermark delay, minor UI fixes https://github.com/opensearch-project/dashboards-query-workbench/pull/173
+UI fixes for loading state, empty tree, added toast for error, fixed no indicies error https://github.com/opensearch-project/dashboards-query-workbench/pull/176
+Session update, minor fixes for acceleration flyout https://github.com/opensearch-project/dashboards-query-workbench/pull/179
+Add backticks and remove ckpt for manual refresh in acceleration flyout https://github.com/opensearch-project/dashboards-query-workbench/pull/183
+UI-bug fixes, added create query for MV https://github.com/opensearch-project/dashboards-query-workbench/pull/182
+added fix for loading spinner issue for other database https://github.com/opensearch-project/dashboards-query-workbench/pull/189
+Fix error handling for user w/o proper permissions https://github.com/opensearch-project/dashboards-query-workbench/pull/195
+Add minutes option to acceleration https://github.com/opensearch-project/dashboards-query-workbench/pull/249
+added changes for cancel query not being able to cancel https://github.com/opensearch-project/dashboards-query-workbench/pull/256
+
+### Infrastructure
+
+Fix jest tests https://github.com/opensearch-project/dashboards-query-workbench/pull/255
+
+### Maintenance
+
+Increment version to 2.12.0.0 https://github.com/opensearch-project/dashboards-query-workbench/pull/164
+Onboard Jenkins prod docker images to github actions https://github.com/opensearch-project/dashboards-query-workbench/pull/198
+Bump Cypress to version 12 https://github.com/opensearch-project/dashboards-query-workbench/pull/234
+Add E2E Cypress workflow for sql workbench https://github.com/opensearch-project/dashboards-query-workbench/pull/235
+Add FTR workflow for sql workbench https://github.com/opensearch-project/dashboards-query-workbench/pull/239
+Add eslint workflow https://github.com/opensearch-project/dashboards-query-workbench/pull/245
+babel config change: https://github.com/opensearch-project/dashboards-query-workbench/pull/229
+