Remove unnecessary classes from VSA Path navigation

What does this MR do and why?

This MR removes the classes added to the VSA path navigation. They are not needed, as they result in a shift of the page content once the loading in finished.

Screenshots or screen recordings

Before	After
Screen_Recording_2022-01-12_at_12.56.22	Screen_Recording_2022-01-12_at_12.55.46

How to set up and validate locally

• Browse to VSA and watch the page load
• http://localhost:3000/groups/gitlab-org/-/analytics/value_stream_analytics

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #217485 (closed)

app/assets/javascripts/cycle_analytics/components/path_navigation.vue

@@ -57,7 +57,7 @@ export default {
 };
 </script>
 <template>
-  <gl-skeleton-loading v-if="loading" :lines="2" class="h-auto pt-2 pb-1" />
+  <gl-skeleton-loading v-if="loading" :lines="2" />
   <gl-path v-else :key="selectedStage.id" :items="stages" @selected="onSelectStage">
     <template #default="{ pathItem, pathId }">
       <gl-popover