Telemetry Frequency incorrectly affects before and after fuzzing telemetry collection #1790

Per centipede_flags.inc, before-fuzzing and after-fuzzing telemetry data should always be dumped, regardless of the value of the telemetry_frequency flag. However, right now, this is only partially true. Corpus telemetry is not dumped if telemetry_frequency is zero, while RUsage telemetry is.

This occurs because DumpCorpusTelemetryInThisShard checks telemetry_frequency and requires it to be non-zero, while DumpRUsageTelemetryInThisShard does not make this check.

DumpCorpusTelemetryInThisShard should be updated to remove the requirement that telemetry_frequency is non-zero.