The list-hook-usage.py should also support skins. I can see two ways of doing that:
- use a command line option like --skins to make it look for skins, instead of extensions
- support skin: and extension: as a prefix for the names listed in the input.
We could also support both. And on top, support putting full repo URLs into the input.
This is a follow-up to T354654. For reference, the script lives in the code-utils repo.