[Test] [Java] Add test example of how to handle x-parent without REF_AS_PARENT_IN_ALLOF normalization#22058

wing328 merged 2 commits intoOpenAPITools:masterOpenAPITools/openapi-generator:masterfrom

Mattias-Sehlstedt:allof-with-several-parentsMattias-Sehlstedt/openapi-generator:allof-with-several-parentsCopy head branch name to clipboard