Allow different HTTP subsections

[NamelessOne91]

This PR contains a breaking change: .yml files with HTTP entries formatted according to the previous syntax will no longer work

Related to https://github.com/SUSE/spacewalk/issues/25285

This PRs allows to define .yaml files such as the following.
As per the changes in the way we define SCC entries, it is now possible to group together HTTP URLs for repositories sharing the same architectures, instead of having to define them individually.

storage:
  type: file
  path: /srv/mirror

http:
  repositories:
    - urls: 
        - http://test/SLE-Product-SLES15-SP5-Pool/
        - http://test/SLE-Product-SLES15-SP5-Updates/
      archs: [x86_64, aarch64, s390x]
    - urls:
        - http://test/SLE-Product-SLES15-SP6-Pool/
        - http://test/SLE-Product-SLES15-SP6-Updates/
      archs: [x86_64, aarch64]