Demote unstable tests from daily run (#29147)

* Demote unstable tests from daily run

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/cypress/tests/integration/channels/mark_as_unread/bot_post_mark_as_unread_spec.js

@@ -7,7 +7,6 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @mark_as_unread
 
 import {beUnread} from '../../../support/assertions';

e2e-tests/cypress/tests/integration/channels/mark_as_unread/toast_appears_unread_spec.js

@@ -7,7 +7,6 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @mark_as_unread
 
 import {markAsUnreadFromPost, switchToChannel} from './helpers';

e2e-tests/cypress/tests/integration/channels/mark_as_unread/unread_toast_count_spec.js

@@ -7,7 +7,6 @@
 // - Use element ID when selecting an element. Create one if none.
 // ***************************************************************
 
-// Stage: @prod
 // Group: @channels @mark_as_unread
 
 describe('Verify unread toast appears after repeated manual marking post as unread', () => {