Update package.json references in convert script

- Changed the target package.json path from "react-on-rails" to "react-on-rails-pro" in the convert script.
- Updated the version of "react" and "react-dom" to "18.0.0" in the dummy package.json files.

These changes ensure the convert script correctly references the new package structure and versions.

Author: AbanoubGhadban

script/convert

@@ -39,7 +39,7 @@ gsub_file_content("../package.json", /"react-dom": "[^"]*",/, '"react-dom": "18.
 gsub_file_content("../spec/dummy/package.json", /"react": "[^"]*",/, '"react": "18.0.0",')
 gsub_file_content("../spec/dummy/package.json", /"react-dom": "[^"]*",/, '"react-dom": "18.0.0",')
 gsub_file_content(
-  "../packages/react-on-rails/package.json",
+  "../packages/react-on-rails-pro/package.json",
   "jest tests",
   'jest tests --testPathIgnorePatterns=\".*(RSC|stream|' \
   'registerServerComponent|serverRenderReactComponent|SuspenseHydration).*\"'