Ensure the function `ensureCustomResourceDefinitionsExist` returns when
the duration specified in `retryCRDIntervalMax` flag is reached.
This works by passing a context to the backoff so that we can
timeout with context.WithTimeout. The new (correct) default duration for
the flag is 30s to give a bit more time when controller and CRD are
created at the same time.
Also limit the amount of resources returned by the list calls to 0 to
speed up the operations because we only care that the CRD exists.
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