Solve problem of people commenting on moved/promoted issues
### Problem
- Right now when you “move” an issue to another project, it is closed and a new one is created in the target project.
- This is similar for marking issues as duplicates.
- So when users go to the previous/duplicate issues, they have to scroll to the bottom of the system notes and click to access the new issue.
### Solution in this order, as needed:
- https://gitlab.com/gitlab-org/gitlab-ce/issues/36445 to help make it obvious when you navigate to an issue.
- https://gitlab.com/gitlab-org/gitlab-ce/issues/56449 so you don't mistakenly comment if unintended.
- https://gitlab.com/gitlab-org/gitlab-ce/issues/56818 to be even more aggressive.
- Have automatic redirects so that the previous/duplicate issue links go to the new one.
- You should still be able to access the old issues explicitly. Perhaps you need to have some URL params that tells GitLab not to redirect. And these could appear in the system notes of the issue you are redirected to.
- We also have to handle the situation of how to render the links of the duplicate / moved issues.
epic