Add integration test to validate that codemod urls are accessible

[Dani Alcala]

See comment for background

Most / all codemods have a url used for documentation and reference. We want to make sure we didn't accidentally copy/paste the wrong url or that the url may be down.

Write an integration test that visits all codemod urls (or maybe just sonar urls??) and that asserts 200 response. Instead of sequential visit to each url which would take time, consider doing so async or in parallel somehow, such as with httpx or something else.