[Housekeeping] Pass the current action when calling the yt-dlp runner

[kieraneglin]

What's new?

• All calls to the yt-dlp runner now pass an action argument where the action is typically the current method name
  • This resolves a long-standing issue with the way yt-dlp is mocked in tests. Since there's only one "entrypoint" into yt-dlp, it made mocking with Mox extremely error prone and fragile since mocks would have to either abuse the fact that some yt-dlp calls had different arity or pattern match against things like the output template. The new approach allows me to match based on the action being taken (a proxy for a method name in a more typical setup) and now I can be sure that I'm mocking the correct thing and I don't have to resort to sketchy bodges. Again, this isn't typically an issue but it was in this case since the run method is essentially an opaque entrypoint into a whole host of other functions.
    I was resistant to this change for a while since it places a pure testing concern into my app's code, but I'm okay with it after seeing the new API it presents. Besides, its surface area is small since I have a delegation layer for these calls
  • Adds logging of the current action
  • Updates a lot of tests
  • Pre-req for [Triage] Unable to download age restricted videos, using cookies #509

What's changed?

N/A

What's fixed?

N/A

Any other comments?

N/A