perf(core): Make user controller tests faster (no-changelog) (#7819)

Before: `17.949 s`
After: `3.886 s`

Followup to:
https://github.com/n8n-io/n8n/pull/7797#discussion_r1404148034

packages/cli/test/integration/shared/utils/users.ts

@@ -0,0 +1,15 @@
+import type { PublicUser } from '@/Interfaces';
+
+export const validateUser = (user: PublicUser) => {
+	expect(typeof user.id).toBe('string');
+	expect(user.email).toBeDefined();
+	expect(user.firstName).toBeDefined();
+	expect(user.lastName).toBeDefined();
+	expect(typeof user.isOwner).toBe('boolean');
+	expect(user.isPending).toBe(false);
+	expect(user.signInType).toBe('email');
+	expect(user.settings).toBe(null);
+	expect(user.personalizationAnswers).toBeNull();
+	expect(user.password).toBeUndefined();
+	expect(user.globalRole).toBeDefined();
+};