Enum Setter and Getter behaviour is incorrect for invalid choices

[Rangababu-R]

Version information
0.1.31

Describe the bug
snappi: enum setter accepts any value and the same can be retrieved in getter method.
gosnappi: Any invalid value can will be set to unspecified or default

To Reproduce

python:
c = sanity.Api().prefix_config()
c.response = "abc"
c.response returns abc
go:
c := openapiart.NewPrefixConfig()
c.SetResponse("abc")
c.Response() returns "status_200" as the default is status_200

Expected behavior
shall append to the validation errors, in setter