test(core): add tests for page info ui (#5769)

![image.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/T2klNLEk0wxLh4NRDzhk/64419f79-46e8-4171-b853-5908841f827a.png)

packages/frontend/i18n/src/resources/en.json

@@ -1107,7 +1107,7 @@
   "com.affine.page-properties.backlinks": "Backlinks",
   "com.affine.page-properties.page-info": "Page Info",
   "com.affine.page-properties.settings.title": "customize properties",
-  "com.affine.page-properties.add-property": "Add a property",
+  "com.affine.page-properties.add-property": "Add property",
   "com.affine.page-properties.add-property.menu.header": "Properties",
   "com.affine.page-properties.create-property.menu.header": "Type",
   "com.affine.page-properties.add-property.menu.create": "Create property",