Dry up the codes hashing variable for runner

What does this MR do?

This MR tries to dry up the codes hashing variable for runner. I don't expect to merge this immidiately. Instead, I'd like to discuss what solution is the best. This MR is just my proposal.

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

Why was this MR needed?

For the consistency of GitLab code base.

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
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #33042 (moved)