[MM-67377] cherry-pick Fix (#35336) (#35657)

Automatic Merge

server/channels/app/plugin_api.go

@@ -1305,6 +1305,10 @@ func (api *PluginAPI) UpdateCommand(commandID string, updatedCmd *model.Command)
 		updatedCmd.TeamId = oldCmd.TeamId
 	}
 
+	if appErr := api.app.validateCommandTriggerUniqueness(updatedCmd.TeamId, updatedCmd.Trigger, updatedCmd.Id); appErr != nil {
+		return nil, appErr
+	}
+
 	return api.app.Srv().Store().Command().Update(updatedCmd)
 }