MM-52641 MM-52645 Playwright/Accessibility: Initial setup and accessibility fix on login page (#23254)

* MM-52641 Playwright/Accessibility: initial setup

* upgrade Playwright to 1.36.1

* fix accessibility at login page

* fix lint

* update snapshot

e2e-tests/playwright/support/ui/components/channels/post_dot_menu.ts

@@ -11,7 +11,7 @@ export default class PostDotMenu {
     constructor(container: Locator) {
         this.container = container;
 
-        this.deleteMenuItem = this.container.getByText('Delete', {exact: true});   
+        this.deleteMenuItem = this.container.getByText('Delete', {exact: true});
     }
 
     async toBeVisible() {