text: Title: Should MutatingWebhook failurePolicy be `Ignore`?
  Body: /kind feature
  
  **Describe the solution you'd like**
  Not sure if this is a bug or a feature request, but the MutatingWebhook `failurePolicy`s are set to `Ignore`, which means it is easy to not notice if your webhook calls are failing.  This was noticed when debugging #1795.  
  
  Is this the best configuration?  Are there cases where having the Experiment and Pod mutations fail can still lead to viable setups?  If there are not, maybe `failurePolicy: Fail` would be better so configuration errors are easier to find.  
  
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