[Fleet] fix flaky test create agent policy (elastic#241251)

## Summary

Closes elastic#213370

Fix flaky test by making the assert agnostic to the order in the package
policies array.

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(cherry picked from commit b4b36d0)

Author: juliaElastic

x-pack/platform/test/fleet_api_integration/apis/agent_policy/agent_policy.ts

@@ -2271,8 +2271,7 @@ export default function (providerContext: FtrProviderContext) {
       });
     });
 
-    // FLAKY: https://github.com/elastic/kibana/issues/213370
-    describe.skip('POST /internal/fleet/agent_and_package_policies', () => {
+    describe('POST /internal/fleet/agent_and_package_policies', () => {
       before(async () => {
         await esArchiver.load('x-pack/platform/test/fixtures/es_archives/fleet/empty_fleet_server');
         await kibanaServer.savedObjects.cleanStandardList();
@@ -2386,11 +2385,13 @@ export default function (providerContext: FtrProviderContext) {
           .expect(200);
 
         expect(createdPolicy.id).to.eql(requestBody.id);
-        expect(createdPolicy.package_policies[0].id).to.eql(requestBody.package_policies[0].id);
+        expect(createdPolicy.package_policies.map((policy: any) => policy.id).sort()).to.eql([
+          'test-package-policy-with-id',
+          'test-package-policy-with-id-2',
+        ]);
         expect(createdPolicy.package_policies[0].policy_ids).to.eql(
           requestBody.package_policies[0].policy_ids
         );
-        expect(createdPolicy.package_policies[1].id).to.eql(requestBody.package_policies[1].id);
         expect(createdPolicy.package_policies[1].policy_ids).to.eql(
           requestBody.package_policies[1].policy_ids
         );