refactor(specGenerator)/remove request-prop param

[chappelo]

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Closing issues
closes #1663

adjusted spec generators to match in params (removed request-prop)

https://github.com/OAI/OpenAPI-Specification/blob/main/versions/2.0.md
https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.0.md

Test plan

added test cases for both SpecGenerator2 and SpecGenerator3 to ensure request-props aren't added to the spec.

[jackey8616]

@chappelo
Can you provide a positive test cases covers the allowed in value of parameters?
Both 2.0 and 3.0 OAI.

We should take this chances to cover all possible values.

[jackey8616]

LGTM.