Stabilize and demote tests (#29367)

* Stabilize and demote tests

e2e-tests/cypress/tests/integration/channels/system_console/site_configuration/link_customization_cloud_spec.js

@@ -7,7 +7,6 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @system_console @enterprise @cloud_only
 
 import * as TIMEOUTS from '../../../../fixtures/timeouts';