Currently, the utilities for testing Firebase redirects assume that the redirects are configured using the glob-based `source` property. However, Firebase also supports configuring redirects using regular expressions (via the `regex` property). See the [Firebase docs][1] for more details. This commit refactors the utilities in `firebase-test-utils/` to make it easy to add support for such regex-based redirect configurations. [1]: https://firebase.google.com/docs/hosting/full-config#redirects PR Close #41842