Block move and clone of requirement issues

What does this MR do and why?

We are migrating requirements from its own table to work items, this is step IIa of the plan.

Blocks cloning or moving issues of type requirement.

Related to #337189 (closed)

How to set up and validate locally

We have no UI for requirements as work items yet, for now there is no way to test this.

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.