Add a test for URL previews being disabled in e2e rooms (#8270)

* Add a test for URL previews being disabled in e2e rooms

Regression test for https://github.com/matrix-org/matrix-react-sdk/pull/8227

* Fix the types

package.json

@@ -152,6 +152,7 @@
     "@types/react": "17.0.14",
     "@types/react-beautiful-dnd": "^13.0.0",
     "@types/react-dom": "17.0.9",
+    "@types/react-test-renderer": "^17.0.1",
     "@types/react-transition-group": "^4.4.0",
     "@types/sanitize-html": "^2.3.1",
     "@types/zxcvbn": "^4.4.0",