Expose `move_design` policy in GraphQL permission types
What does this MR do and why?
Exposes move_design
policy already available in app/policies/project_policy.rb#L404
in GraphQL API to use for design management frontend as required by #508576
MR acceptance checklist
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
Related to #508575