Merge branch '346167-Inline-code-coverage' into 'master'

No-coverage lines more prominent than covered lines.

See merge request gitlab-org/gitlab!80743

app/assets/stylesheets/highlight/common.scss

@@ -53,11 +53,11 @@
   transition: border-left 0.1s ease-out;
 
   &.coverage {
-    border-left: 4px solid $coverage;
+    border-left: 2px solid $coverage;
   }
 
   &.no-coverage {
-    border-left: 2px solid $no-coverage;
+    border-left: 4px solid $no-coverage;
   }
 }