feat(xo-server/rest-api/dashboard): add vmsProtection information

[MathieuRA]

Description

• protected: The VM is included in at least one active job with a successful result in its last execution.
• unprotected: The VM is in a job without an enabled schedule, or the VM is in an active job, but the last job execution was not successful.
• notInJob: The VM is either not part of any job or has the xo:no-bak tag

• VMs with xo:no-bak tag are always counted in notInJob (since they are not backed up)
• VMs replications are not counted at all (this mean the sum of protected, unprotected and notInJob can be different from the total number of "VMs".
• Backed-up VMs in a failed backup job are counted as protected.
• For non smartMode backup, VMs that no longer exist in the infrastructure are not counted.

{
   ...
   backups: {
      ...
      vmsProtection: {
         protected: number,
         unprotected: number,
         notInJob: number
      }
   } | undefined
}

Checklist

• Commit
  • Title follows commit conventions
  • Reference the relevant issue (Fixes #007, See xoa-support#42, See https://...)
  • If bug fix, add Introduced by
• Changelog
  • If visible by XOA users, add changelog entry
  • Update "Packages to release" in CHANGELOG.unreleased.md
• PR
  • If UI changes, add screenshots
  • If not finished or not tested, open as Draft