Stabilise Cypress login tests (#9446)

* Attempt to stabilise login tests

* More stability

* Stabilise s'more

* don't clear LS as we rely on it for enablements

* Add small delay

* Iterate

* Update login.ts

cypress/e2e/timeline/timeline.spec.ts

@@ -329,7 +329,7 @@ describe("Timeline", () => {
             cy.getComposer().type(`${MESSAGE}{enter}`);
 
             // Reply to the message
-            cy.get(".mx_RoomView_body").contains(".mx_EventTile_line", "Hello world").within(() => {
+            cy.contains(".mx_RoomView_body .mx_EventTile_line", "Hello world").within(() => {
                 cy.get('[aria-label="Reply"]').click({ force: true }); // Cypress has no ability to hover
             });
         };