[MM-23017] Add check for groups to SendNotifications (#14039)

* MM-23017 Check group mentions as part of notification logic

* Add nil groups to existing test cases

* MM-23017 Add tests for insertGroupMention and addGroupMention

* MM-23017 Add tests for getExplicitMentions that have groups

* Add tests for group store GetMemberUsersNotInChannel

* MM-23017 Add tests for AllowGroupMentions

* MM-23017 Fix error message name

* MM-23017 Swap Checks to Name

* MM-23017 Code review fixes

* Rename var and fix allowGroupMentions test

* MM-23017 Use GetMemberUsersInTeam inside of insertGroupMentions

* MM-23017 use group mentions permission

* Actually call GetMemberUsersInTeam

* Remove unnecessary new line

* Uncomment filter allow reference

* MM-23017 Fix group channel notifications

* Update store layer

* MM-23017 Improve test coverage for group channels

* Trigger CI

* Trigger CI

i18n/en.json

@@ -1600,6 +1600,10 @@
     "id": "api.plugin.verify_plugin.app_error",
     "translation": "Unable to verify plugin signature."
   },
+  {
+    "id": "api.post.check_for_out_of_channel_group_users.message.none",
+    "translation": "@{{.GroupDisplayName}} has no members on this team"
+  },
   {
     "id": "api.post.check_for_out_of_channel_groups_mentions.message.multiple",
     "translation": "@{{.Usernames}} and @{{.LastUsername}} did not get notified by this mention because they are not in the channel. They cannot be added to the channel because they are not a member of the linked groups. To add them to this channel, they must be added to the linked groups."