Better indication that an issue has been duplicated

What does this MR do?

https://gitlab.com/gitlab-org/gitlab-ce/issues/57783

Adds information to a closed issue label to indicate that it is a duplicate and links it to the new issue.

EE PORT -> https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/16204

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance 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