Allow designs to be mutated when issue is moved/locked

What does this MR do?

Previously designs could not be added (or moved, deleted) when the issue had been locked or moved.

This was out-of-step with the rules around commenting on an issue, where permissions don't change on a moved issue, and only change on a locked issue if the user is not a member.

As create, move and destroy permissions on designs are only enabled for project group members >= developer, the new rules are to allow previous levels of design permissions on both locked and moved issues.

Issue: #217882 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done