Remove redundant license scanning code

What does this MR do and why?

This MR removes code that's no longer referenced:

1. The apply_details_from method was removed in Remove N+1 in license scanning report comparison (!42895 - merged), and no other code references this method.
2. The merge_dependencies_info method is only called by the apply_details_from method, and no other code references this method.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.