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/i18n/en.json

@@ -1977,10 +1977,6 @@
     "id": "api.incoming_webhook.invalid_username.app_error",
     "translation": "Invalid username."
   },
-  {
-    "id": "api.insights.feature_disabled",
-    "translation": "Insights is behind a feature flag which is not enabled."
-  },
   {
     "id": "api.invalid_channel",
     "translation": "Channel listed in the request doesn't belong to the user"
@@ -5831,10 +5827,6 @@
     "id": "app.insert_error",
     "translation": "insert error"
   },
-  {
-    "id": "app.insights.feature_disabled",
-    "translation": "Insights feature is disabled."
-  },
   {
     "id": "app.job.download_export_results_not_enabled",
     "translation": "DownloadExportResults in config.json is false. Please set this to true to download the results of this job."
@@ -6295,18 +6287,6 @@
     "id": "app.post.get_root_posts.app_error",
     "translation": "Unable to get the posts for the channel."
   },
-  {
-    "id": "app.post.get_top_dms_for_user_since.app_error",
-    "translation": "Unable to get top DMs for user."
-  },
-  {
-    "id": "app.post.get_top_threads_for_team_since.app_error",
-    "translation": "Unable to get top threads for team."
-  },
-  {
-    "id": "app.post.get_top_threads_for_user_since.app_error",
-    "translation": "Unable to get top threads for user."
-  },
   {
     "id": "app.post.marshal.app_error",
     "translation": "Failed to marshal post."
@@ -9071,10 +9051,6 @@
     "id": "model.incoming_hook.username.app_error",
     "translation": "Invalid username."
   },
-  {
-    "id": "model.insights.get_start_of_day_for_time_range.time_range.app_error",
-    "translation": "Invalid time range."
-  },
   {
     "id": "model.job.is_valid.create_at.app_error",
     "translation": "Create at must be a valid time."