ShaAttribute crashes with ArgumentError if column doesn't exist

What does this MR do?

Only issues a warning if a sha_attribute column doesn't exist in development

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

The thrown exception would stop gdk run from running, making it more difficult to run migrations.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated
• [-] API support added
• Tests added for this feature/bug
• Review
  • [-] Has been reviewed by UX
  • [-] Has been reviewed by Frontend
  • Has been reviewed by Backend
  • [-] Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• [-] Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/5963