CLD-7841 Optimize E2E testing costs (#27883)

* Utilize free runners for E2E tests, report back to PR on run completion
* Increase test stability on smaller instances
* Merge worker reports
* merge start+prepare steps
* upgrade keycloak
* increase test timeouts
* Add video recording to report artifacts

Co-authored-by: Saturnino Abril <5334504+saturninoabril@users.noreply.github.com>

---------

Co-authored-by: Saturnino Abril <5334504+saturninoabril@users.noreply.github.com>

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

@@ -11,6 +11,7 @@
 // Group: @channels @mark_as_unread
 
 import {markAsUnreadFromPost, switchToChannel} from './helpers';
+import * as TIMEOUTS from '../../../fixtures/timeouts';
 
 describe('Verify unread toast appears after repeated manual marking post as unread', () => {
     let firstPost;
@@ -33,7 +34,10 @@ describe('Verify unread toast appears after repeated manual marking post as unre
                     cy.visit(`/${team.name}/channels/${testChannel.name}`);
                     switchToChannel(offTopicChannel);
 
-                    cy.postMessageAs({
+                    // Ensure that the Off-Topic channel has loaded successfully, before posting messages in the other channel
+                    cy.get('#channelHeaderTitle').should('be.visible').and('contain.text', offTopicChannel.display_name);
+
+                    cy.wait(TIMEOUTS.ONE_SEC).postMessageAs({
                         sender: otherUser,
                         message: 'First message',
                         channelId: testChannel.id,