Add E2E test infrastructure for rook plugin

- playwright.config.ts with authenticated test projects
- e2e/auth.setup.ts authenticates via OIDC or token
- e2e/rook.spec.ts smoke tests for sidebar, overview page,
  storage classes navigation, and plugin settings
- scripts/deploy-e2e-headlamp.sh deploys Headlamp + rook in headlamp-dev
- scripts/teardown-e2e-headlamp.sh cleans up after tests
- e2e.yaml uses reusable workflow from .github repo
- @playwright/test ^1.58.2 devDep added

- PRI-640

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.gitignore

@@ -6,3 +6,9 @@ dist/
 .env.local
 .eslintcache
 .playwright-mcp/
+
+# E2E
+e2e/.auth/
+.env.e2e
+playwright-report/
+test-results/