Repro for microsoft/playwright#15498: Re-Use KeyCloak

To run, clone the repo, then:

$ npm i
$ npx playwright test

Observe:

Running 3 tests using 3 workers

  ✓  [webkit] › tests/example.spec.ts:3:1 › should already be logged in and can click on tokens (11s)
  ✓  [firefox] › tests/example.spec.ts:3:1 › should already be logged in and can click on tokens (12s)
  ✓  [chromium] › tests/example.spec.ts:3:1 › should already be logged in and can click on tokens (11s)