Resolve "NoMethodError: undefined method `log_info' for Geo::RepositorySyncWorker"

What does this MR do?

Fixes a NoMethodError seen on master

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

The inheritance hierarchy is quite complicated. Notes in #5555 (closed) might help.

I've opened https://gitlab.com/gitlab-org/gitlab-ee/issues/5556 to discuss a broader refactoring.

ExclusiveLeaseGuard implements its own log_error so we need to put Gitlab::Geo::LogHelpers after it for now.

Why was this MR needed?

Fix a bug introduced during the course of 10.7 development

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 Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Closes #5555 (closed)