Remove append-right-2 CSS class

This removes the append-right-2 CSS
class and replaces it for the gl-mr-1
utility class from GitLab-UI

app/assets/stylesheets/framework/common.scss

@@ -407,7 +407,6 @@ img.emoji {
 .prepend-left-default { margin-left: $gl-padding; }
 .prepend-left-20 { margin-left: 20px; }
 .prepend-left-64 { margin-left: 64px; }
-.append-right-2 { margin-right: 2px; }
 .append-right-5 { margin-right: 5px; }
 .append-right-10 { margin-right: 10px; }
 .append-right-15 { margin-right: 15px; }

ee/app/assets/javascripts/roadmap/components/epic_item_timeline.vue

@@ -185,7 +185,7 @@ export default {
               aria-hidden="true"
             />
             <div class="gl-font-sm d-flex align-items-center text-nowrap">
-              <icon class="append-right-2" :size="12" name="weight" />
+              <icon class="gl-mr-1" :size="12" name="weight" />
               <p class="m-0" :aria-label="epicWeightPercentageText">{{ epicWeightPercentage }}%</p>
             </div>
           </div>