CI: Check if all paths inside paths/ are included in paths.yml

[Foorack]

This to avoid paths from being forgotten to be added to paths.yml. If they are not in there, then the bundler will not be aware of them, and therefore not include them.

[jellejurre]

Isnt this done by 00fac57?
@Foorack

[Foorack]

@jellejurre I think specifically if a path is implemented, but missing from paths.yml, that is missed. Basically it needs to check if there are "unreferenced path implementations", a.k.a check for unused files in the project.

[Foorack]

There has been cases where either me or someone else implements an entire API section, but then it doesn't show up, simply because it is missing from paths.yml.