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>

server/public/model/preference.go

@@ -19,7 +19,6 @@ const (
 	PreferenceCategoryFlaggedPost       = "flagged_post"
 	PreferenceCategoryFavoriteChannel   = "favorite_channel"
 	PreferenceCategorySidebarSettings   = "sidebar_settings"
-	PreferenceCategoryInsights          = "insights"
 
 	PreferenceCategoryDisplaySettings     = "display_settings"
 	PreferenceNameCollapsedThreadsEnabled = "collapsed_reply_threads"
@@ -31,7 +30,6 @@ const (
 	PreferenceNameNameFormat              = "name_format"
 	PreferenceNameUseMilitaryTime         = "use_military_time"
 	PreferenceRecommendedNextSteps        = "recommended_next_steps"
-	PreferenceNameInsights                = "insights_tutorial_state"
 
 	PreferenceCategoryTheme = "theme"
 	// the name for theme props is the team id