Feature Request/Idea: Remove unused imports and methods

Overview of the Feature Request

Code that is never executed within Dataverse and that is unreachable from outside Dataverse should be removed. Unused imports should also be removed.

What kind of user is the feature intended for?
Developers

What inspired the request?
Many files in the codebase are messy and have low test coverage. But because of the messiness, it is hard to see what should be covered by tests.

This is also part of my all-time quest to improve the codebase, started a long time ago.

What existing behavior do you want changed?
No behaviour should change.

Any brand new behavior do you want to add to Dataverse?
No behaviour needs to be added.

Any open or closed issues related to this feature request?

• #775 is the original code style issue
• #9009 is an example that unused code can be removed
• #9846 and #9847 should help keep up the quality by monitoring unused imports and methods

Start by reviewing the original code-style issue #775, the removal example in #9009, and the monitoring issues #9846 and #9847 to understand the intended scope. Done means unused imports and unreachable code are removed across the relevant Dataverse code without changing behavior.