[terraform] deploy backup 0.5.0 to prod

Summary:
Deploy the work tracked as part of ENG-9644.

Changes are diffs from the stack starting with D13803.

Backup images are here

Git tag link.

The staging deploy was on Nov 7, so it's been less than a week. However, the Backup service is not used on production at all, so I'm publishing this diff ahead of time.

Test Plan: terraform plan

Reviewers: bartek, varun

Reviewed By: bartek

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13904