Refs #18539 - Introduce foreman_plugin_files in foreman.macros

[ekohl]

This allows plugins to use %files -f foreman_plugin_files and automatically get the correct files section, based on the foreman_bundlerd_file and foreman_precompile_plugin macros (and their options).

[evgeni]

But this also means we need to adjust every single plugin spec, while just adjusting the existing macros does not require it?

[ekohl]

True, but the idea I have is to and up with less logic in gem2rpm/foreman_plugin.spec.erb anyway. Combined with https://github.com/theforeman/foreman-packaging/pull/8414 I'd like to get rid of a lot of templating.

Perhaps it's better to separate that out, but I wanted to see. Friday always has time for a bit of experimentation, right?