[release-10.11] Restrict group_constrained to channels that support group sync (#36916)

Automatic Merge

server/i18n/en.json

@@ -455,6 +455,10 @@
     "id": "api.channel.patch_update_channel.forbidden.app_error",
     "translation": "Failed to update the channel."
   },
+  {
+    "id": "api.channel.patch_update_channel.group_constrained_not_allowed.app_error",
+    "translation": "You are not allowed to set group_constrained on this channel type."
+  },
   {
     "id": "api.channel.patch_update_channel.update_direct_or_group_messages_not_allowed.app_error",
     "translation": "You are not allowed to update the name, display_name, and purpose of direct or group messages."
@@ -8980,6 +8984,10 @@
     "id": "model.channel.is_valid.display_name.app_error",
     "translation": "Invalid display name."
   },
+  {
+    "id": "model.channel.is_valid.group_constrained.app_error",
+    "translation": "Only public and private channels can be group constrained."
+  },
   {
     "id": "model.channel.is_valid.header.app_error",
     "translation": "Invalid header."