Prevent Gitaly N+1 queries in blob search

What does this MR do?

Fix N+1 queries caused by #118669 (closed)

This MR avoids this by treating binary_path the same as blob_path, which is used to comparison, avoiding loading blob data.

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

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers