Remove insights (#23952)

* removed server side

* Updated store layer

* unused import

* Updated autogenerated code template

* Updated tests

* lint fix

* unused translations

* webapp side

* Updated i18n

* lint fix:

* type fix

* Updated snapshots

* Removed insights from API specs

* updated e2e

* Updated e2e tests

* Updated e2e tests

* Removed insights tests

* Removed Insights as possible channel to load in sidebar from test

* Removed more insights tests

* More e2e fixed

* More cleanup

* Lint

* More cleanup in client4 and boards api

* More cleanup

* Fixes

* lint fix

---------

Co-authored-by: maria.nunez <maria.nunez@mattermost.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

api/v4/source/introduction.yaml

@@ -579,8 +579,6 @@ tags:
     description: Endpoints for interactive actions for use by integrations.
   - name: shared channels
     description: Endpoints for getting information about shared channels.
-  - name: insights
-    description: Endpoints for getting insights into teams and users.
   - name: terms of service
     description: Endpoints for getting and updating custom terms of service.
   - name: imports
@@ -635,7 +633,6 @@ x-tagGroups:
       - schemes
       - integration_actions
       - shared channels
-      - insights
       - terms of service
       - imports
       - permissions