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/toast/unread_with_bottom_start_toast_spec.js

@@ -38,6 +38,7 @@ describe('unread_with_bottom_start_toast', () => {
         cy.apiCreateChannel(testTeam.id, 'channel-a', 'ChannelA').then(({channel}) => {
             cy.apiAddUserToChannel(channel.id, otherUser.id).then(() => {
                 cy.visit(`/${testTeam.name}/channels/${channel.name}`);
+                cy.get('#loadingSpinner').should('not.exist'); // The channel should fully load once, before it can mark messages as "new"
                 cy.uiClickSidebarItem('off-topic');
                 cy.postMessage('hi');
 
@@ -73,6 +74,7 @@ describe('unread_with_bottom_start_toast', () => {
         cy.apiCreateChannel(testTeam.id, 'channel-b', 'ChannelB').then(({channel}) => {
             cy.apiAddUserToChannel(channel.id, otherUser.id).then(() => {
                 cy.visit(`/${testTeam.name}/channels/${channel.name}`);
+                cy.get('#loadingSpinner').should('not.exist'); // The channel should fully load once, before it can mark messages as "new"
                 cy.uiClickSidebarItem('off-topic');
                 cy.postMessage('hi');
 
@@ -114,6 +116,10 @@ describe('unread_with_bottom_start_toast', () => {
                     cy.postMessageAs({sender: otherUser, message: `test message ${index}`, channelId: channel.id}).wait(50);
                 }
 
+                // # Switch channel and back
+                cy.uiClickSidebarItem('off-topic');
+                cy.uiClickSidebarItem(channel.name);
+
                 cy.wait(TIMEOUTS.ONE_SEC);
 
                 // # Scroll to the top to find the oldest message
@@ -123,6 +129,7 @@ describe('unread_with_bottom_start_toast', () => {
                     // # Mark post as unread
                     cy.uiClickPostDropdownMenu(postId, 'Mark as Unread');
                 });
+                cy.get('div.toast').should('be.visible').contains('30 new messages'); // The toast message should appear right away
 
                 // # Visit off-topic channel and switch back to test channel
                 cy.uiClickSidebarItem('off-topic');