Move Lazy Loading tests from Puppeteer to Cypress (#8982)

* Remove Puppeteer Lazy Loading tests

* Remove Puppeteer Lazy Loading tests

* Remove Puppeteer Lazy Loading tests

* Stash lazy loading cypress tests

* Stash lazy loading cypress tests

* Update cypress-real-events

* Stash offline-less test

* Add offline/online'ing

cypress/support/client.ts

@@ -124,6 +124,11 @@ declare global {
              * Boostraps cross-signing.
              */
             bootstrapCrossSigning(): Chainable<void>;
+            /**
+             * Joins the given room by alias or ID
+             * @param roomIdOrAlias the id or alias of the room to join
+             */
+            joinRoom(roomIdOrAlias: string): Chainable<Room>;
         }
     }
 }
@@ -217,3 +222,7 @@ Cypress.Commands.add("bootstrapCrossSigning", () => {
         });
     });
 });
+
+Cypress.Commands.add("joinRoom", (roomIdOrAlias: string): Chainable<Room> => {
+    return cy.getClient().then(cli => cli.joinRoom(roomIdOrAlias));
+});