[Ubuntu] Simplify APT commands flow in download-requirements.py

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Is your feature request related to a problem? Please describe. Current flow for a package is:

1. apt-cache show
2. apt-cache policy
3. apt-cache depends
4. apt download

It looks like apt-cache policy may be replaced by apt-cache show, which seems to return the candidate version at the top, for example:

apt-cache policy filebeat | grep Candidate
  Candidate: 7.17.5

vs

apt-cache show filebeat | grep Version | head -1
Version: 7.17.5

Describe the solution you'd like Refactor get_package_info method in ansible/playbooks/roles/repository/files/download-requirements/src/command/debian/apt_cache.py to not use __get_package_candidate_version. The latter probably can be removed.

Describe alternatives you've considered Keep current flow if necessary.

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