Added GET endpoint for getting available backups (Sourcery refactored)

[sourcery-ai[bot]]

Pull Request #428 refactored by Sourcery.

If you're happy with these changes, merge this Pull Request using the Squash and merge strategy.

NOTE: As code is pushed to the original Pull Request, Sourcery will re-run and update (force-push) this Pull Request with new refactorings as necessary. If Sourcery finds no refactorings at any point, this Pull Request will be closed automatically.

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Review changes via command line

To manually merge these changes, make sure you're on the list_available_backups branch, then run:

git fetch origin sourcery/list_available_backups
git merge --ff-only FETCH_HEAD
git reset HEAD^