add playright setup + migrate a few tests in example app

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

package.json

@@ -18,6 +18,7 @@
     "clean": "backstage-cli repo clean",
     "test": "backstage-cli repo test",
     "test:all": "backstage-cli repo test --coverage",
+    "test:e2e": "playwright test",
     "fix": "backstage-cli repo fix",
     "lint": "backstage-cli repo lint --since origin/master",
     "lint:docs": "node ./scripts/check-docs-quality",
@@ -58,9 +59,11 @@
     "@backstage/cli": "workspace:*",
     "@backstage/codemods": "workspace:*",
     "@backstage/create-app": "workspace:*",
+    "@backstage/e2e-test-utils": "workspace:*",
     "@backstage/repo-tools": "workspace:*",
     "@changesets/cli": "^2.14.0",
     "@octokit/rest": "^19.0.3",
+    "@playwright/test": "^1.32.3",
     "@spotify/eslint-plugin": "^14.1.3",
     "@spotify/prettier-config": "^14.0.0",
     "@techdocs/cli": "workspace:*",