Remove placeholder UI

What does this MR do and why?

This MR removes the placeholder UI from the remote_dev integration branch.

Screenshots or screen recordings

This MR does not contain user-facing changes.

How to set up and validate locally

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 #409091 (closed)