test: demote unstable tests (#36127)

e2e-tests/cypress/tests/integration/channels/enterprise/accessibility/accessibility_modals_dialogs_spec.ts

@@ -7,7 +7,6 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @enterprise @accessibility
 
 import {Channel} from '@mattermost/types/channels';

e2e-tests/cypress/tests/integration/channels/interactive_dialog/scrollable_spec.js

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

e2e-tests/cypress/tests/integration/channels/keyboard_shortcuts/system_message_not_open_for_edit_spec.js

@@ -7,7 +7,6 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @keyboard_shortcuts
 
 describe('Keyboard Shortcuts', () => {