feature: playwright e2e tests form electron application

[vojtech-cerveny]

Same as #1643 but for in-browser-merged branch.

• basic flow how we can use playwright for basic tests of UI

• Adding new way how to handle incoming urls (call it from test)
  tidepooluploader://localhost/keycloak-redirect#state....

      await window.evaluate((url) => {
        window.electron.handleIncomingUrl(url);
      }, href);

How to test:
Add these variables (qa2 personal account) into .env

E2E_USER_EMAIL=
E2E_USER_PASSWORD=

• yarn test:e2e --headed for visible Chrome
• yarn test:e2e

It is draft, please let me know what do you think about my changes.

[vojtech-cerveny]

Currently I am trying to setup circleCI and I am not sure where can be a problem - it seems, that Electron doesn't have access to internet. But I tried to curl to google before running tests and it returns status code 200.

Check video from test.
It stucks on this screen:

1f81c21831e5194fb3eadd406437e929.webm

CircleCI build