In #59571, utilccl.CheckEnterpriseEnabled was called much more often in the read path, via kvfollowerreadsccl.canSendToFollower. However, CheckEnterpriseEnabled has a couple of performance issues:

1. We're instantiating a pgerror.Newf() in utilccl.check() when enterprise features are unavailable -- this is often necessary because we include cluster-specific info in the error message, but is expensive. However, in this specific case the caller just needs to know if there was an error, not the actual error message, so we should provide a variant using a generic, static error message.

2. We're decoding the license (if any) on each call, see: