test(stream): add unit tests for stream behavior

- Fix duplicating EOF error when closing SSH connection
- Add new SessionStatusCLOSED type

internal/http/stream/stream.go

@@ -72,7 +72,10 @@ func (hs *http) ResponseMiddlewares() []middleware.ResponseMiddleware {
 }
 
 func (hs *http) Close() error {
-	return hs.writer.(io.Closer).Close()
+	if closer, ok := hs.writer.(io.Closer); ok {
+		return closer.Close()
+	}
+	return nil
 }
 
 func (hs *http) CloseWrite() error {