build_artifact.csharp_ext_windows_x86 Timeout

```
2021-05-05 12:38:47,434 TIMEOUT: build_artifact.csharp_ext_windows_x86 [pid=6748, time=1800.1sec]
```

https://source.cloud.google.com/results/invocations/83842c4f-49af-4fae-bc72-806a8d8ada41/log