Should use ApiPlatform's CustomerProvider

[kayue]

I noticed AdminOrderCreationPlugin has its own CustomerProvider

AdminOrderCreationPlugin/src/Provider/CustomerProvider.php

Lines 39 to 49 in 62485d9

	public function provideNewCustomer(string $email): CustomerInterface
	{
	/** @var CustomerInterface $customer */
	$customer = $this->customerFactory->createNew();
	$customer->setEmail($email);
	$this->customerRepository->add($customer);
	return $customer;
	}

It should use the one from \Sylius\Bundle\ApiBundle\Provider\CustomerProviderInterface so that it can support Sylius Plus properly.