Show issue weights on Milestone view lists

app/assets/stylesheets/page_bundles/milestone.scss

@@ -65,15 +65,32 @@ $status-box-line-height: 26px;
     line-height: $line-height-base;
     padding: 14px 16px;
     display: flex;
+    justify-content: space-between;
 
     .title {
       flex: 1;
       flex-grow: 2;
     }
 
-    .counter {
-      flex: 0;
-      padding-left: 16px;
+    .issuable-count-weight {
+      white-space: nowrap;
+
+      .counter,
+      .weight {
+        color: var(--gray-500, $gray-500);
+        font-weight: $gl-font-weight-bold;
+      }
+    }
+
+    &.text-white {
+      .issuable-count-weight svg {
+        fill: $white;
+      }
+
+      .issuable-count-weight .counter,
+      .weight {
+        color: var(--white, $white);
+      }
     }
   }
 }

app/views/shared/milestones/_issuable.html.haml

@@ -25,3 +25,5 @@
         = link_to polymorphic_path(issuable_type_args, { milestone_title: @milestone.title, assignee_id: assignee.id, state: 'all' }),
                   class: 'has-tooltip', title: _("Assigned to %{assignee_name}") % { assignee_name: assignee.name }, data: { container: 'body' } do
           - image_tag(avatar_icon_for_user(assignee, 16), class: "avatar s16", alt: '')
+
+    = render_if_exists "shared/milestones/issuable_weight", issuable: issuable

app/views/shared/milestones/_issuables.html.haml

@@ -4,11 +4,15 @@
 
 .card
   .card-header{ class: panel_class }
-    .title
-      = title
-    - if show_counter
-      .counter
-        = number_with_delimiter(issuables.length)
+    .header.gl-mb-2
+      .title
+        = title
+    .issuable-count-weight.gl-ml-3
+      - if show_counter
+        %span.counter
+          = sprite_icon('issues', css_class: 'gl-vertical-align-text-bottom')
+          = number_with_delimiter(issuables.length)
+      = render_if_exists "shared/milestones/issuables_weight", issuables: issuables
 
   - class_prefix = dom_class(issuables).pluralize
   %ul{ class: "content-list milestone-#{class_prefix}-list", id: "#{class_prefix}-list-#{id}" }

ee/app/views/shared/milestones/_issuable_weight.html.haml

+- issuable = local_assigns.fetch(:issuable)
+
+- return unless issuable.weight_available?
+- return unless issuable.weight?
+
+%span.issuable-number
+  = sprite_icon('weight', css_class: 'gl-vertical-align-text-bottom')
+  = issuable.weight

ee/app/views/shared/milestones/_issuables_weight.html.haml

+- issuables = local_assigns.fetch(:issuables)
+- issuables_with_weight = issuables.select(&:weight_available?).map(&:weight).compact
+
+- return if issuables_with_weight.empty?
+
+%span.weight.gl-ml-3
+  = sprite_icon('weight', css_class: 'gl-vertical-align-text-bottom')
+  = issuables_with_weight.sum