Added finish review dropdown

What does this MR do and why?

Adds a finish review dropdown to the merge request reviews bar that allows users to add a comment when submitting a review.

Screenshots or screen recordings

How to set up and validate locally

Enable mr_review_submit_comment

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.

Closes #244044 (closed)

app/assets/javascripts/batch_comments/components/drafts_count.vue

@@ -6,13 +6,20 @@ export default {
   components: {
     GlBadge,
   },
+  props: {
+    variant: {
+      type: String,
+      required: false,
+      default: 'info',
+    },
+  },
   computed: {
     ...mapGetters('batchComments', ['draftsCount']),
   },
 };
 </script>
 <template>
-  <gl-badge size="sm" variant="info" class="gl-ml-2">
+  <gl-badge size="sm" :variant="variant" class="gl-ml-2">
     {{ draftsCount }}
     <span class="sr-only"> {{ n__('draft', 'drafts', draftsCount) }} </span>
   </gl-badge>