[25754] Remove line between special fields and info line

https://community.openproject.com/projects/openproject/work_packages/25754

[ci skip]

app/assets/stylesheets/content/work_packages/single_view/_single_view.sass

@@ -164,6 +164,16 @@ i
   &:before
     @include varprop(color, $body-font-color)
 
+// Avoid top border and spacing for special projects/select attribute group
+.attributes-group.-special-fields
+  margin-top: 0.5em
+
+  .attributes-group--header,
+  .attributes-group--header-container
+    border: 0
+    padding: 0
+    margin: 0
+
 
 // Implement two column layout for WP full screen view
 @media screen and (min-width: 90rem)

frontend/app/components/work-packages/wp-single-view/wp-single-view.directive.html

@@ -7,7 +7,7 @@
     <op-date-time date-time-value="$ctrl.workPackage.updatedAt"></op-date-time>.
   </div>
 
-  <div class="attributes-group">
+  <div class="attributes-group -special-fields">
     <div class="attributes-group--header">
       <div class="attributes-group--header-container">
       </div>