Clean up component

- create new computed property for button configurations

ee/app/assets/javascripts/vulnerabilities/components/header.vue

@@ -56,16 +56,20 @@ export default {
   },
 
   computed: {
-    actionButtons() {
-      const buttons = [];
-      const issueButton = {
+    actions() {
+      return {
+        issueCreation: {
           name: s__('ciReport|Create issue'),
           isLoading: this.isProcessing,
           action: 'createIssue',
+        },
       };
+    },
+    actionButtons() {
+      const buttons = [];
 
       if (!this.hasIssue) {
-        buttons.push(issueButton);
+        buttons.push(this.actions.issueCreation);
       }
 
       return buttons;