Draft: Service desk Ticket - legacy view switch

What does this MR do and why?

Adds a 'Legacy View' switcher for service desk tickets.

issue: #414313

Screenshots or screen recordings

TODO

Before	After

How to set up and validate locally

TODO

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.