* Introduce setting hidden from UI, such that openApiSpec version 2 has the nullable references properly serialized.
AnyOf does not exist in v2, and those references are currently lost.
* Updating existing tests for nullable/schema areas where v2 and v3 differ
Making them theories to properly test both openApi specifications
Adding relevant yaml, json test files
Modifying code to ensure enums and entities also generate openApi with no anyOf for openApi v2 (not supported)
* Fix "Succeeded" typo in output for util
Fix tab spacing in util
Add version setting in util with documentation
* Remove tabs
* Refactor tests to take SpecVersion directly in InlineData
Modify 2 existing tests to test json schema generation by passed spec version
