[Multiple Datasource] Add data source aggregated view to show all com…

…patible data sources or only show used data sources (#6129)

* add data source aggregated view to show all compatible data sources or only used data sources

Signed-off-by: Lu Yu <nluyu@amazon.com>

* add change log

Signed-off-by: Lu Yu <nluyu@amazon.com>

* address comments and add more tests

Signed-off-by: Lu Yu <nluyu@amazon.com>

---------

Signed-off-by: Lu Yu <nluyu@amazon.com>

CHANGELOG.md

@@ -42,10 +42,12 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [Workspace] Add delete saved objects by workspace functionality([#6013](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6013))
 - [Workspace] Add a workspace client in workspace plugin ([#6094](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6094))
 - [Multiple Datasource] Add component to show single selected data source in read only mode ([#6125](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6125))
+- [Multiple Datasource] Add data source aggregated view to show all compatible data sources or only show used data sources ([#6129](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6129))
 - [Workspace] Add workspace id in basePath ([#6060](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6060))
 - Implement new home page ([#6065](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6065))
 - Add sidecar service ([#5920](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5920))
 
+
 ### 🐛 Bug Fixes
 
 - [BUG][Discover] Allow saved sort from search embeddable to load in Dashboard ([#5934](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/5934))