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/README.md

@@ -45,7 +45,7 @@ npm run test
 Change to root directory, run docker container
 
 ```
-docker run -it --rm -v "$(pwd):/mattermost/" --ipc=host mcr.microsoft.com/playwright:v1.32.0-focal /bin/bash
+docker run -it --rm -v "$(pwd):/mattermost/" --ipc=host mcr.microsoft.com/playwright:v1.36.0-focal /bin/bash
 ```
 
 #### 2. Inside the docker container