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/channels/app/plugin_api.go

@@ -621,6 +621,11 @@ func (api *PluginAPI) UpdateChannelMemberNotifications(channelID, userID string,
 	return api.app.UpdateChannelMemberNotifyProps(api.ctx, notifications, channelID, userID)
 }
 
+func (api *PluginAPI) PatchChannelMembersNotifications(members []*model.ChannelMemberIdentifier, notifications map[string]string) *model.AppError {
+	_, err := api.app.PatchChannelMembersNotifyProps(api.ctx, members, notifications)
+	return err
+}
+
 func (api *PluginAPI) DeleteChannelMember(channelID, userID string) *model.AppError {
 	return api.app.LeaveChannel(api.ctx, channelID, userID)
 }