Convert to Customer to working anymore.

[JelleGe]

Magento version #: 2.4.6-p2

Edition (EE, CE, OS, etc): CE

Expected behavior: Convert order to customer

Actual behavior: Error message; A customer with the same email address already exists in an associated website.

It's not possible anymore to convert a guest order to a customer, when there is already an existing customer with the same email address. Then we fetch the error: A customer with the same email address already exists in an associated website.