chore: Surface parse duration error in operator (argoproj#5814)

Signed-off-by: terrytangyuan <[email protected]>

workflow/controller/operator.go

@@ -2798,7 +2798,7 @@ func parseStringToDuration(durationString string) (time.Duration, error) {
  } else if duration, err := time.ParseDuration(durationString); err == nil {
  suspendDuration = duration
  } else {
- return 0, fmt.Errorf("unable to parse %s as a duration", durationString)
+ return 0, fmt.Errorf("unable to parse %s as a duration: %w", durationString, err)
  }
  return suspendDuration, nil
 }