MM-63669 E2E/Playwright: Move "e2e-tests/playwright/test" to "e2e-tests/playwright" folder (#30647)

* move "e2e-tests/playwright/test" to  "e2e-tests/playwright/test" and expose "ensurePluginsLoaded"

* add test setup, and expose ensurePluginsLoaded and ensureServerDeployment to pw

.gitignore

@@ -40,9 +40,9 @@ e2e-tests/playwright/playwright-report
 e2e-tests/playwright/storage_state
 e2e-tests/playwright/test-results
 e2e-tests/playwright/results
-e2e-tests/playwright/tests/**/*-darwin.png
-e2e-tests/playwright/tests/**/*-window.png
-e2e-tests/playwright/tests/accessibility/**/*-snapshots
+e2e-tests/playwright/specs/**/*-darwin.png
+e2e-tests/playwright/specs/**/*-window.png
+e2e-tests/playwright/specs/accessibility/**/*-snapshots
 e2e-tests/playwright/.eslintcache
 
 # ignore temporary added configuration for pgloader