Replace dashed-list.scss with an unordered list

The dashed-list was used in the staging workflow info box. There were a
dew issues when rendering longer project names, which could be solved by
using an unordered list.
This also fixes the dash that was missing for the first element.

Fixes #6314

src/api/app/assets/stylesheets/webui2/webui2.css.scss

@@ -24,7 +24,6 @@
 @import 'breadcrumbs-component';
 @import 'tabs-component';
 @import 'personal-navigation';
-@import 'dashed-list';
 @import 'list-group-item-integrated';
 @import 'icons';
 @import 'kaminari';

src/api/app/views/webui2/webui/staging/workflows/_empty_projects_list.html.haml

@@ -1,7 +1,7 @@
 - if projects.empty?
   None
 - else
-  %ol.dashed-list.pl-2
+  %ul.pl-4
     - projects.sort.each do |project|
-      %li.dashed-list-item
+      %li
         = link_to(project.staging_identifier, project_show_path(project.name))