Move Repository#wrapped_gitaly_errors into concern

What does this MR do?

Having this in a concern allows us to reuse it for different single purpose classes that call out to git without going through the repository every time.

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.