[terraform] deploy backup 0.5.0 to staging

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

Changes are diffs from the stack starting with D13803.

Backup images are here

Test Plan: terraform plan

Reviewers: bartek, tomek, varun, angelika

Reviewed By: bartek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13893