HTTP2: Improve "GOAWAY received" status message (#31619)

* Improve GOAWAY received status message

* Remove unused if

src/core/ext/transport/chttp2/transport/chttp2_transport.cc

@@ -985,12 +985,15 @@ void grpc_chttp2_add_incoming_goaway(grpc_chttp2_transport* t,
                                      uint32_t goaway_error,
                                      uint32_t last_stream_id,
                                      absl::string_view goaway_text) {
-  // Discard the error from a previous goaway frame (if any)
-  if (!t->goaway_error.ok()) {
-  }
   t->goaway_error = grpc_error_set_str(
       grpc_error_set_int(
-          grpc_error_set_int(GRPC_ERROR_CREATE("GOAWAY received"),
+          grpc_error_set_int(
+              grpc_core::StatusCreate(
+                  absl::StatusCode::kUnavailable,
+                  absl::StrFormat(
+                      "GOAWAY received; Error code: %u; Debug Text: %s",
+                      goaway_error, goaway_text),
+                  DEBUG_LOCATION, {}),
               grpc_core::StatusIntProperty::kHttp2Error,
               static_cast<intptr_t>(goaway_error)),
           grpc_core::StatusIntProperty::kRpcStatus, GRPC_STATUS_UNAVAILABLE),