[Bug]: The generated C# service code should not contain 'Copyright (c) Microsoft Corporation'

[lirenhe]

Describe the bug

I found we are adding the following line in both of the generated code and server stub code

https://github.com/allenjzhang/typespec-e2e-demo/blob/a666c27152e2b9fe65250161c80b444467b090e4/todoApp/servers/aspnet/generated/lib/ArrayConstraintAttribute.cs#L1

I don't think we shall add the following line as they are targeting for 3rd party usage.

// Copyright (c) Microsoft Corporation. All rights reserved.

Reproduction

1. Use the following config in tspconfig.yaml

emit:

• "@typespec/http-server-csharp"
  options:
  "@typespec/http-server-csharp":
  emitter-output-dir: "{project-root}/../servers/aspnet/generated"

2. Run tsp compile to generate the c# service code

Expected: The generated code should not contain Microsoft related copy right.
Actual: It shows the code above.

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