Suggest database review for app/finders

What does this MR do?

This is a Danger/CODEOWNERs change to add app/finders for database review.

It would have suggested a database review for #198324 (closed), for example.

Suggestion by @ahegyi

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content