Initialise Design Management Vue app in CE

Imports ~/design_management chunk in CE so that
we attempt to mount Vue app in a CE Issue. Previously,
this happened on EE issues.

Design Management will still not be visible in CE, as
the `.js-design-management.` element is only
present on EE.

app/assets/javascripts/pages/projects/issues/show.js

@@ -12,6 +12,16 @@ export default function() {
   initIssueableApp();
   initSentryErrorStackTraceApp();
   initRelatedMergeRequestsApp();
+
+  // js-design-management is currently EE-only.
+  // This will be moved to CE as part of https://gitlab.com/gitlab-org/gitlab/-/issues/212566#frontend
+  // at which point this conditional can be removed.
+  if (document.getElementById('js-design-management')) {
+    import(/* webpackChunkName: 'design_management' */ '~/design_management')
+      .then(module => module.default())
+      .catch(() => {});
+  }
+
   new Issue(); // eslint-disable-line no-new
   new ShortcutsIssuable(); // eslint-disable-line no-new
   new ZenMode(); // eslint-disable-line no-new

ee/app/assets/javascripts/pages/projects/issues/show/index.js

@@ -10,12 +10,6 @@ document.addEventListener('DOMContentLoaded', () => {
   }
   initRelatedIssues();
 
-  if (document.getElementById('js-design-management')) {
-    import(/* webpackChunkName: 'design_management' */ '~/design_management')
-      .then(module => module.default())
-      .catch(() => {});
-  }
-
   // eslint-disable-next-line no-new
   new UserCallout({ className: 'js-epics-sidebar-callout' });
   // eslint-disable-next-line no-new