[Go] uses sanitized model name instead of the name

[vvb]

Fixes #18632

@antihax @grokify @kemokemo @jirikuncar @ph4r5h4d @lwj5 @wing328

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• Read the contribution guidelines.
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[wing328]

thanks for the PR. please add the new folder to https://github.com/OpenAPITools/openapi-generator/blob/master/CI/circle_parallel.sh#L45 so that circleci will test it moving forward.

[wing328]

you will need to add a pom.xml as well in the new folder (by copying it from another go sample folder and modify it a bit, e.g. new artifactId)

[vvb]

you will need to add a pom.xml as well in the new folder (by copying it from another go sample folder and modify it a bit, e.g. new artifactId)

done.

[wing328]

lgtm. thanks for the PR