MM-56083 Add PatchMultipleMembersNotifyProps plugin API (#25690)

* Add ChannelStore.UpdateMultipleMembersNotifyProps

* Make UpdateMultipleMembersNotifyProps return updated values from the DB

* Add UpdateChannelMembersNotifications plugin API

* Extract i18n

* Fix style

* Make layers

* Change to PatchMultipleMembersNotifyProps

* Add limit to PatchChannelMembersNotifyProps

* Add additional unit tests

* Address feedback

* Lowercase decodeJSON

* Have PatchMultipleMembersNotifyProps update LastUpdateAt

* Fix tests that relied on unreliable return order

* Fix i18n

server/i18n/en.json

@@ -5054,6 +5054,14 @@
     "id": "app.channel.move_channel.members_do_not_match.error",
     "translation": "Unable to move a channel unless all its members are already members of the destination team."
   },
+  {
+    "id": "app.channel.patch_channel_members_notify_props.app_error",
+    "translation": "Unable to update channel members' notify props."
+  },
+  {
+    "id": "app.channel.patch_channel_members_notify_props.too_many",
+    "translation": "Unable to update that many channel members. Only {{.Max}} channel members can be updated at once."
+  },
   {
     "id": "app.channel.permanent_delete.app_error",
     "translation": "Unable to delete the channel."