Removes labels from a contact.
The unlabelContact() function returns a Promise
that resolves when the specified labels are removed from the contact.
If a label is no longer needed and you want to remove it from all contacts, you can remove it with the Labels deleteLabel() function.
You can only call this method when authenticated as a Wix app or Wix user identity.
ID of the contact to remove labels from.
List of label keys to remove from the contact.