SEC-10095 test(cypress): demote unstable tests (#36099)

* test(cypress): demote unstable tests

* follow fixes

* fix merging playwright reports

e2e-tests/cypress/tests/integration/channels/scroll/channel_scroll_spec.js

@@ -7,7 +7,6 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @scroll
 
 import * as MESSAGES from '../../../fixtures/messages';

e2e-tests/cypress/tests/integration/channels/scroll/fixed_width_spec.js

@@ -9,7 +9,6 @@ const timeouts = require('../../../fixtures/timeouts');
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @scroll
 
 describe('Scroll', () => {