Provide better feedback on restore failures

What does this MR do and why?

• Provide an error message if restore fails
• Provide a notification when restore completes.
• I've tried and have not yet been able to get a restore to fail.
• Attempts to resolve #627

Screenshots or screen recordings

How to set up and validate locally

• Restore a backup

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?