Remove unused layout preset and state dropdown

What does this MR do and why?

This MR is a follow-up on !72419 (merged) and removes the last remaining pieces of unused code for Roadmap.

Screenshots or screen recordings

This MR has no visual impact.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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.

Related to #323917 (closed)