fix(openapi-generator): wrap nullable $ref parameters in an 'allOf' array

[ekorenblum-simtlix]

DX-376

OpenAPI spec doesn't allow $ref properties to have siblings (see here), so they're wrapped in an 'allOf' array

Old behavior

propertyName:
  nullable: true
  $ref: '#/components/schemas/Foo'

New bahavior

propertyName:
  nullable: true
  allOf: 
    - $ref: '#/components/schemas/Foo'

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