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>

e2e-tests/.ci/server.override.yml

@@ -27,7 +27,6 @@ services:
       MM_SERVICESETTINGS_ENABLEONBOARDINGFLOW: "false"
       MM_FEATUREFLAGS_ONBOARDINGTOURTIPS: "false"
       MM_SERVICEENVIRONMENT: "test"
-      MM_FEATUREFLAGS_INSIGHTSENABLED: "true"
     volumes:
     - "server-config:/mattermost/config"
     ports: