Move EE differences for `app/assets/javascripts/notes/components/note_body.vue`

The file app/assets/javascripts/notes/components/note_body.vue has differences between CE and EE.

Diferences

diff --git a/home/yorickpeterse/Projects/gitlab/gdk-ce/gitlab/app/assets/javascripts/notes/components/note_body.vue b/home/yorickpeterse/Projects/gitlab/gdk-ee/gitlab/app/assets/javascripts/notes/components/note_body.vue
index bcf5d334da4..82b6cd35ec2 100644
--- a/home/yorickpeterse/Projects/gitlab/gdk-ce/gitlab/app/assets/javascripts/notes/components/note_body.vue
+++ b/home/yorickpeterse/Projects/gitlab/gdk-ee/gitlab/app/assets/javascripts/notes/components/note_body.vue
@@ -1,5 +1,5 @@
 <script>
-import { mapActions } from 'vuex';
+import { mapGetters, mapActions } from 'vuex';
 import $ from 'jquery';
 import noteEditedText from './note_edited_text.vue';
 import noteAwardsList from './note_awards_list.vue';
@@ -43,6 +43,7 @@ export default {
     },
   },
   computed: {
+    ...mapGetters(['getDiscussion']),
     noteBody() {
       return this.note.note;
     },
@@ -52,6 +53,11 @@ export default {
     lineType() {
       return this.line ? this.line.type : null;
     },
+    discussion() {
+      if (!this.note.isDraft) return {};
+
+      return this.getDiscussion(this.note.discussion_id);
+    },
   },
   mounted() {
     this.renderGFM();
@@ -76,8 +82,8 @@ export default {
     renderGFM() {
       $(this.$refs['note-body']).renderGFM();
     },
-    handleFormUpdate(note, parentElement, callback) {
-      this.$emit('handleFormUpdate', note, parentElement, callback);
+    handleFormUpdate(note, parentElement, callback, resolveDiscussion) {
+      this.$emit('handleFormUpdate', note, parentElement, callback, resolveDiscussion);
     },
     formCancelHandler(shouldConfirm, isDirty) {
       this.$emit('cancelForm', shouldConfirm, isDirty);
@@ -112,6 +118,8 @@ export default {
       :note="note"
       :help-page-path="helpPagePath"
       :markdown-version="note.cached_markdown_version"
+      :discussion="discussion"
+      :resolve-discussion="note.resolve_discussion"
       @handleFormUpdate="handleFormUpdate"
       @cancelForm="formCancelHandler"
     />

What needs to be done

1. Create a EE mixin in the /ee folder for the differences in the script tag.
2. Create a CE counterpart of that mixin with a computed prop for discussion that returns an empty object and the handleFormUpdate
3. Create a computed prop for note.resolve_discussion in both mixins, the one in CE should be empty.
4. Move the template differences to CE
5. Guarantee that specs exist or are added