Force rerendering of sprite icon components

With our new Chrome workaround we might render outdated icons in vue. By
adding a key, we can ensure that the icon component is re-rendered if
the icon that is supposed to be rendered changes.

app/assets/javascripts/vue_shared/components/file_icon.vue

@@ -87,7 +87,7 @@ export default {
   <span>
     <gl-loading-icon v-if="loading" :inline="true" />
     <gl-icon v-else-if="isSymlink" name="symlink" :size="size" />
-    <svg v-else-if="!folder" :class="[iconSizeClass, cssClasses]">
+    <svg v-else-if="!folder" :key="spriteHref" :class="[iconSizeClass, cssClasses]">
       <use v-bind="{ 'xlink:href': spriteHref }" />
     </svg>
     <gl-icon v-else :name="folderIconName" :size="size" class="folder-icon" />

app/assets/javascripts/vue_shared/components/icon.vue

@@ -61,7 +61,12 @@ export default {
 </script>
 
 <template>
-  <svg :class="[iconSizeClass, iconTestClass]" aria-hidden="true" v-on="$listeners">
+  <svg
+    :key="spriteHref"
+    :class="[iconSizeClass, iconTestClass]"
+    aria-hidden="true"
+    v-on="$listeners"
+  >
     <use v-bind="{ 'xlink:href': spriteHref }" />
   </svg>
 </template>