test(improve-setup): sharding configuration, allow accessing cornerstone methods and events in tests, and add types (#4255)

package.json

@@ -49,6 +49,7 @@
     "test:unit:ci": "lerna run test:unit:ci --parallel --stream",
     "test:e2e": "lerna run test:e2e --stream",
     "test:e2e:ci": "npx playwright test",
+    "test:e2e:ui": "npx playwright test --ui",
     "test:e2e:headed": "npx playwright test --headed",
     "test:e2e:dist": "lerna run test:e2e:dist --stream",
     "test:e2e:serve": "yarn test:data && lerna run test:e2e:serve --stream",