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
George Kalpakas
Pete Bacon Darwin
Miško Hevery