Provide task to check integrity of backup file and display backup metadata

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Proposal

Backups can sometimes fail to be created correctly and result in backup files that cannot be fully restored. Administrators may want to verify the correctness of a backup file after it has been created.

This issue proposes the creation of a new option for the gitlab-backup task to read in a backup file (from local or object storage) and

• check that there is sufficient space to extract the backup file locally
• check whether the file is able to be fully extracted
• output details from backup_information.yml file
• output sized of backup components (packages, lfs, builds, registry, repositories etc.)
• optionally include name and size of each repository bundle in backup

Related to:

• ZD internal link
• Problems arise if there are multiple parallel Omnibus backup/restore processes
• Need mechanism to discover backup-problems
• Restore does very little validate before unpacking backup
• meta Backup/Restore improvements