Unnecessary namespace for type from shared files in generated SDK

[live1206]

We have shared files included into compile, the types in them are generated with full namespace.
Azure/azure-sdk-for-net#47136 (comment)

[pshao25]

The thing more important than removing the namespace is we should make sure we are referring the one from shared code, not the one from the azure.core package.

[live1206]

The thing more important than removing the namespace is we should make sure we are referring the one from shared code, not the one from the azure.core package.

I don't think this would happen. If we have same type from shared code and public package, it won't compile.