doc: add release notes for 2.10 (#258) (#259)

* doc: add release notes for 2.10

Signed-off-by: tygao <tygao@amazon.com>

* doc: append prs

Signed-off-by: tygao <tygao@amazon.com>

* doc: separate prs

Signed-off-by: tygao <tygao@amazon.com>

---------

Signed-off-by: tygao <tygao@amazon.com>
(cherry picked from commit db0003d)

Co-authored-by: tygao <tygao@amazon.com>

release-notes/opensearch-ml-commons-dashboards.release-notes-2.10.0.0.md

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+## Version 2.10.0.0 Release Notes
+
+Compatible with OpenSearch 2.10.0
+
+
+### Features
+
+* Add source field to distinguish local and external model. ([#239](https://github.com/opensearch-project/ml-commons-dashboards/pull/239))
+* Support external models in deployed model list. ([#248](https://github.com/opensearch-project/ml-commons-dashboards/pull/248))
+* Support external models in model preview panel. ([#252](https://github.com/opensearch-project/ml-commons-dashboards/pull/252))
+
+
+### Enhancements
+
+* Mitigate styles to oui variables. ([#227](https://github.com/opensearch-project/ml-commons-dashboards/pull/227)) 
+
+### Bug Fixes
+
+* Fix no model show up when search a model. ([#238](https://github.com/opensearch-project/ml-commons-dashboards/pull/238))
+* Migrate style to oui attributes and add fallback dash. ([#254](https://github.com/opensearch-project/ml-commons-dashboards/pull/254))
+* Replace dash with em dash. ([#255](https://github.com/opensearch-project/ml-commons-dashboards/pull/255))