[CSharp/touchsocket] Mark platform tests as stripped

[p8]

Touchsocket hardcodes HTTP headers for the platform tests, so it should be marked as Stripped:

FrameworkBenchmarks/frameworks/CSharp/touchsocket/src/TouchSocketHttpPlatform/MyTcpSessionClientBase.cs

Lines 51 to 61 in d36a2ed

	private static ReadOnlySpan<byte> PlaintextPreamble =>
	"HTTP/1.1 200 OK\r\n"u8 +
	"Server: T\r\n"u8 +
	"Content-Type: text/plain\r\n"u8 +
	"Content-Length: 13"u8;
	private static ReadOnlySpan<byte> JsonPreamble =>
	"HTTP/1.1 200 OK\r\n"u8 +
	"Server: T\r\n"u8 +
	"Content-Type: application/json\r\n"u8 +
	"Content-Length: 27"u8;

From the Test Requirements:

All implementations are expected (but not required) to be based on robust implementations of the HTTP protocol. Implementations that are not based on a realistic HTTP implementation will be marked as Stripped.

Closes: #9578