fix(W-21368901): Update dependencies for deep allOf support

- Update @api-components/api-example-generator to 4.4.36
- Update @api-components/api-type-document to 4.2.42
- Add regression test for deep allOf (4+ levels)
- Add product-order-minimal to demos
- Add nullable spec for W-11650729

Author: alexpmule

demo/apis.json

@@ -38,5 +38,6 @@
   "models/multiple-messages/multiple-messages.yaml": "ASYNC 2.0",
   "models/APIC-560/APIC-560.yaml": "ASYNC 2.0",
   "models/agens-api/agents-api.yaml": "OAS 3.0",
-  "models/nested-examples/nested-examples-oas3.json": "OAS 3.0"
+  "models/nested-examples/nested-examples-oas3.json": "OAS 3.0",
+  "models/nullable/nullable.yaml": "OAS 3.0"
 }

demo/element/app.js

@@ -14,6 +14,7 @@ class ApicApplication extends DemoBase {
   constructor() {
     super();
     this.apis = [
+      ['product-order-minimal', 'W-21368901 - Deep allOf'],
       ['grpc-test', 'gRPC API'],
       ['google-drive-api', 'Google Drive API'],
       ['httpbin', 'HTTPbin API'],