[Task]: Replace all clone() methods with copy a constructor

### What needs to happen?

Sonar considers using clone() (and interface Clonable) as a blocking issue.
A lot of our code already switched over to copy constructors. Let's clean up the remainder.

### Issue Priority

Priority: 3

### Issue Component

Component: Api

Search the repository for remaining clone() methods and Cloneable usage, then compare them with the copy constructors already used elsewhere. The issue identifies the Api component; done means the remaining clone-based implementations there have been replaced consistently with copy constructors.

Written by the indexing model from the issue text.