Revert "DB change, migratoin and changelog"

This reverts commit af5242ecb682189c5d8276e1ab1ffe5ce844f2e5.

app/views/projects/milestones/_form.html.haml

@@ -21,7 +21,7 @@
 
   .form-actions
     - if @milestone.new_record?
-      = f.submit _('Create milestone'), class: 'btn-create btn qa-milestone-create-button'
+      = f.submit _('Create milestone'), class: 'btn-success btn qa-milestone-create-button'
       = link_to _('Cancel'), project_milestones_path(@project), class: 'btn btn-cancel'
     - else
       = f.submit _('Save changes'), class: 'btn-success btn'

changelogs/unreleased/new-project-milestone-primary-button.yml

+---
+title: New project milestone primary button
+merge_request: 32355
+author: Lee Tickett
+type: fixed