Fixed: OXUIB-1397 - Parent or opener do not reference opening window

Root cause: Cross-Origin-Opener-Policy is set to same-origin per default and will prevent parent or window.opener to be set
Solution: Set Cross-Origin-Opener-Policy to same-origin-allow popups

src/createApp.js

@@ -66,7 +66,8 @@ export function createApp () {
   app.use(helmet({
     contentSecurityPolicy: false,
     crossOriginEmbedderPolicy: false,
-    originAgentCluster: false
+    originAgentCluster: false,
+    crossOriginOpenerPolicy: { policy: 'same-origin-allow-popups' }
   }))
   app.use('/healthy', health.LivenessEndpoint(healthCheck))
   app.use('/ready', health.ReadinessEndpoint(healthCheck))