Move Close issue button into dropdown
What does this MR do and why?
Move Close button from issue header into Actions dropdown (#414523[after_default.png] (comment 1453294863))
![#414523[after_default.png] (comment 1453294863)](https://gitlab.com/gitlab-org/gitlab/-/issues/414523/designs/after_default.png#note_1453294863){kind=link}
What does this MR not do?
- Fix the epic notifications dropdown item alignment
- Align ordering between mobile and desktop dropdown (will do after feature flag removal)
Screenshots or screen recordings
| Before | After | |
|---|---|---|
| Issue |  |
 |
| Epic |  |
 |
| Incident |  |
 |
How to set up and validate locally
- Enable
:move_close_into_dropdown - Go to issue, epic, and incident
Edited by Annabel Dunstone Gray