Add KnownIntermittentError for nuttcp timeouts.
Add KnownIntermittentError for nuttcp timeouts.

PiperOrigin-RevId: 346656585

GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker