Resolve "Geo: Does not mark repositories as missing on primary due to stale cache"

What does this MR do?

Resolves issue "Geo: Does not mark repositories as missing on primary due to stale cache".

What are the relevant issue numbers?

• Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/44044
• Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/50211

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