[BUG][GO] oneOf path parameters pointer is used as path parameter in request

[NickUfer]

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• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

When a path parameter is a oneOf the whole oneOf is serialized and not one of the set values.

This is caused by the parameterToString method which serializes the struct to a string

func parameterToString(obj interface{}, collectionFormat string) string {
	var delimiter string

	switch collectionFormat {
	case "pipes":
		delimiter = "|"
	case "ssv":
		delimiter = " "
	case "tsv":
		delimiter = "\t"
	case "csv":
		delimiter = ","
	}

	if reflect.TypeOf(obj).Kind() == reflect.Slice {
		return strings.Trim(strings.Replace(fmt.Sprint(obj), " ", delimiter, -1), "[]")
	} else if t, ok := obj.(time.Time); ok {
		return t.Format(time.RFC3339)
	}

	return fmt.Sprintf("%v", obj) // <---- ## HERE ##
}

openapi-generator version

6.2.1

OpenAPI declaration file content or url

https://gist.github.com/NickUfer/e5f80d9d2173344b4b3331df83e2080e

Generation Details

config file:

disallowAdditionalPropertiesIfNotPresent: true
packageName: directusclient
generateInterfaces: true
structPrefix: true
enumClassPrefix: true

cmd:

generate -i /tmp/oas.yaml -g go -o "/tmp/directusclient" -c /tmp/go.yml

Steps to reproduce

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