Organise service desk code

What does this MR do and why?

This MR moves service desk code to /service_desk directory to organise service desk code

Screenshots or screen recordings

No visual 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.