Merge branch '222528-replace-fa-balance-scale-with-gitlab-scale-icon' into 'master'

Resolve "Replace fa-balance-scale with GitLab scale icon"

Closes #222528

See merge request gitlab-org/gitlab!34617

app/views/projects/blob/viewers/_license.html.haml

 - license = viewer.license
 
-= icon('balance-scale fw')
+= sprite_icon('scale', size: 16)
 This project is licensed under the
 = succeed '.' do
   %strong= license.name

ee/app/views/shared/promotions/_promote_issue_weights.html.haml

@@ -7,7 +7,7 @@
   .block.js-weight-sidebar-callout.promotion-issue-sidebar{ data: { uid: promotion_feature } }
     .sidebar-collapsed-icon{ data: { toggle: "dropdown", target: ".js-weight-sidebar-callout" } }
       %span{ data: { toggle: "tooltip", placement: "left", container: "body" }, title: _("Weight") }
-        = icon('balance-scale')
+        = sprite_icon('scale')
         %span No
     .title.hide-collapsed
       = s_('Promotions|Weight')