Deletes the given ChannelPartnerRepricingConfig permanently. You can only delete configs if their RepricingConfig.effective_invoice_month is set to a date after the current month. Possible error codes: * PERMISSION_DENIED: The account making the request does not own this customer. * INVALID_ARGUMENT: Required request parameters are missing or invalid. * FAILED_PRECONDITION: The ChannelPartnerRepricingConfig is active or in the past. * NOT_FOUND: No ChannelPartnerRepricingConfig found for the name in the request.