Reflect design collection copy state on frontend

What does this MR do?

When an issue is moved, the designs are moved asynchronously. The user will initially see a message that their designs are still being copied. If there is an error during the copy, they will see an error message displayed but will still be able to upload their designs.

This MR is branched from !42919 (merged) and has it as an MR dependency.

• Issue: #13426 (closed)

QA Steps

See !41714 (merged).

Screenshots

Copy in progress state

Screen_Recording_2020-09-17_at_2.32.13_PM

Error state

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