[FEATURE REQUEST] [download-requirements.py] Download files with deb and rpm extensions to packages subdirectory

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Is your feature request related to a problem? Please describe.
We have some packages (e.g. grafana) defined in files.yml. They are downloaded directly from URL (outside package repository) and saved into files sub-directory instead of packages. As consequence they are not part of epirepo package repository but installed using URL.

This has some drawbacks:

1. More difficult dependency management
2. Installation tasks require full URL and additional parameter (disable_gpg_check)
3. dnf info shows @commandline instead of @epirepo

Describe the solution you'd like
If file from files.yml ends with .deb or .rpm it should be downloaded to packages sub-directory.
Then it will be part of epirepo package repository, so packages like grafana or rabbitmq should be installed in the same (simpler) way as others.

Describe alternatives you've considered
n/a

Additional context
n/a

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DoD checklist

• Changelog
  • updated
  • not needed
• COMPONENTS.md
  • updated
  • not needed
• Schema
  • updated
  • not needed
• Backport tasks
  • created
  • not needed
• Documentation
  • added
  • updated
  • not needed
• Feature has automated tests
• Automated tests passed (QA pipelines)
  • apply
  • upgrade
  • backup/restore
• Idempotency tested
• All conversations in PR resolved
• Solution meets requirements and is done according to design doc
• Usage compliant with license