Geo: Fix concurrent VerificationBatchWorkers

What does this MR do?

Fixes deadlocks when running concurrent VerificationBatchWorkers.

Resolves #300051 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry => behind feature flag
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process. => I'm open to suggestions for a good test, but I haven't thought of one yet