[Bug]: The clientOption stub generated by StubLibraryPlugin for versioned cannot compile

[chunyu3]

Describe the bug

When generate stub library for a versioned service, the clientOptions class stub cannot compile because the LastestVersion private field is not generated which is used in public constructor.

generated stub:

namespace Server.Path.Multiple
{
    public partial class MultipleClientOptions : ClientPipelineOptions
    {

        public MultipleClientOptions(ServiceVersion version = LatestVersion) => throw null;

        public enum ServiceVersion
        {
            /// <summary> Version 1.0. </summary>
            V1_0 = 1
        }
    }
}

expected:

namespace Server.Path.Multiple
{
    public partial class MultipleClientOptions : ClientPipelineOptions
    {
        private const ServiceVersion LatestVersion = ServiceVersion.V1_0;

        public MultipleClientOptions(ServiceVersion version = LatestVersion) => throw null;

        public enum ServiceVersion
        {
            /// <summary> Version 1.0. </summary>
            V1_0 = 1
        }
    }
}

Reproduction

Define a versioned service, and then generate stub library for it.

you can use the cadl-ranch test project [http-server-path-multiple ] (https://github.com/Azure/cadl-ranch/tree/main/packages/cadl-ranch-specs/http/server/path/multiple)

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[chunyu3]

Change the solution to not generate the public constructor for clientOptions, like

namespace Server.Path.Multiple
{
    public partial class MultipleClientOptions : ClientPipelineOptions
    {
    }
}