Make "New issue" button in Issue page less obtrusive
Every issue page has two green buttons—Comment and New Issue.
- New Issue is not directly content related and less likely to be used.
- UI Guide says
Use green or blue button for primary action. Primary button should be only one.
Steps to reproduce
Open any issue page.
Only Comment button is a primary button.
Use the same style as for the New Branch button: https://gitlab.com/gitlab-org/gitlab-ce/issues/18928#note_13213925
This would also make it consistent to the New Branch button.