Add release notes for 1.3.0.0 (opensearch-project#206)

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>

Author: ohltyler

release-notes/opensearch-anomaly-detection-dashboards.release-notes-1.3.0.0.md

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+## Version 1.3.0.0 Release Notes
+
+Compatible with OpenSearch Dashboards 1.3.0
+
+### Features
+
+* Non blocker ([#202](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/202))
+
+### Enhancements
+
+* Improve error handling on missing result index errors on detector detail pages ([#158](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/158))
+
+### Bug Fixes
+
+* Force heatmap y-axis to be category type ([#167](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/167))
+* Fix custom expression filter cannot show ([#178](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/178))
+
+### Infrastructure
+
+* Add remote integ test workflow; clean up old integ test workflow ([#163](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/163))
+* Reformat using Prettier CLI and add doc to developer guide ([#168](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/168))
+* Remove Beta label from bug issue template ([#169](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/169))
+* Add .whitesource and config files to activate whitesource integration ([#165](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/165))
+* Using Github App to trigger CI on backport PRs ([#175](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/175))
+* Adding auto delete workflow for backport branches ([#176](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/176))
+* Remove cypress & all integration tests ([#174](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/174))
+* Upgrade follow-redirect dependency ([#179](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/179))
+* Add test IDs to components for integ tests ([#183](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/183))
+
+### Documentation
+
+* Reformat using Prettier CLI and add doc to developer guide ([#168](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/168))
+
+### Maintenance
+
+* Bump plugin to 1.3.0.0 ([#160](https://github.com/opensearch-project/anomaly-detection-dashboards-plugin/pull/160))