[MM-21793] Allow bots to be added to group synced channels and teams (#13672)

* MM-21793: Allow bots to be removed and added from group synced teams and channels

* MM-21793: Add tests for adding and removing a team and channel members

* MM-21793 Add punctuation to comments and remove unnecessary variable

i18n/en.json

@@ -812,7 +812,7 @@
   },
   {
     "id": "api.command_invite.group_constrained_user_denied",
-    "translation": "This channel is managed by groups.  This user is not part of a group that is synched to this channel."
+    "translation": "This channel is managed by groups.  This user is not part of a group that is synced to this channel."
   },
   {
     "id": "api.command_invite.hint",
@@ -1940,7 +1940,7 @@
   },
   {
     "id": "api.team.add_members.user_denied",
-    "translation": "This team is managed by groups.  This user is not part of a group that is synched to this team."
+    "translation": "This team is managed by groups.  This user is not part of a group that is synced to this team."
   },
   {
     "id": "api.team.add_user_to_team.added",