Add fixed testcase back in (#29345)

* Add fixed testcase back in

e2e-tests/cypress/tests/integration/channels/system_console/site_configuration/link_customization_e20_1_spec.js

@@ -7,6 +7,7 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
+// Stage: @prod
 // Group: @channels @system_console @enterprise @e20_only @not_cloud
 
 import * as TIMEOUTS from '../../../../fixtures/timeouts';

e2e-tests/cypress/tests/integration/channels/system_console/site_configuration/link_customization_e20_2_spec.js

@@ -7,6 +7,7 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
+// Stage: @prod
 // Group: @channels @not_cloud @system_console
 
 import {