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-deep-allof to demos (element, standalone, themed)
- Add nullable spec for W-11650729
- Fix test to use correct AMF loader API
- Add AMF model exception to .gitignore

Author: alexpmule

.gitignore

@@ -67,6 +67,7 @@ demo/models/flattened/*.json
 !demo/models/avro2.json
 !demo/models/grpc-test.json
 !demo/models/grpc-test-compact.json
+!demo/models/product-order-deep-allof.json
 
 .idea/
 .sfdx

demo/element/app.js

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