[MM-23019] Create use_group_mentions permission and migrate existing roles (#13987)

* MM-22962 Create use_group_mentions permission and give to all non guest roles that can create post

* Add use_group_mentions to team admin role for test

* Trigger CI

* MM-22962 Remove old migration keys

app/app_test.go

@@ -563,6 +563,7 @@ func TestDoEmojisPermissionsMigration(t *testing.T) {
 		model.PERMISSION_DELETE_OTHERS_EMOJIS.Id,
 		model.PERMISSION_VIEW_MEMBERS.Id,
 		model.PERMISSION_USE_CHANNEL_MENTIONS.Id,
+		model.PERMISSION_USE_GROUP_MENTIONS.Id,
 	}
 	sort.Strings(expectedSystemAdmin)
 
@@ -602,6 +603,7 @@ func TestDoEmojisPermissionsMigration(t *testing.T) {
 		model.PERMISSION_MANAGE_PRIVATE_CHANNEL_MEMBERS.Id,
 		model.PERMISSION_REMOVE_REACTION.Id,
 		model.PERMISSION_USE_CHANNEL_MENTIONS.Id,
+		model.PERMISSION_USE_GROUP_MENTIONS.Id,
 	}
 	sort.Strings(expected2)
 	sort.Strings(role2.Permissions)