[http-client-csharp] public constructor skipped during generation with custom constructor

[live1206]

In https://github.com/Azure/azure-sdk-for-net/pull/54848/files, I was trying to mitigate breaking changes by adding a custom constructor, and expected to generate another overloading public constructor.
But it seems like we only allow one public constructor for the generated model in MTG.

[JoshLove-msft]

I think this was an issue with the visitor ordering, right @live1206?