Add method to list backup files

Andrewrequested to merge
feature/backup-files-api into dev

What does this MR do and why?

  • Add GET method for server backup files to allow users to utilize the API to list their current backups for a specific policy.
  • Implements #710 (closed)

How to set up and validate locally

  1. Using curl or postman GET

    "/api/v2/servers/([a-z0-9-]+)/backups/backup/([a-z0-9-]+)/files/?"

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

  • Have you checked this doesn't interfere/conflict/duplicate someone elses work?
  • Have you fully tested your changes?
  • Have you resolved any lint issues?
  • Have you assigned a reviewer?
  • Have you applied correct labels?
Edited by Andrew

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