Removed deprecated ProductSelectionType

As announced before we have now removed the deprecated type field from ProductSelection and its draft, alongside the deprecated ProductSelectionType. The feature has been replaced by ProductSelectionMode kept in the mode field of the ProductSelection.

Changes:

• [API] Removed the type field from Product Selection and ProductSelectionDraft.
• [API] Removed ProductSelectionTypeEnum, IndividualProductSelectionType, and IndividualExclusionProductSelectionType from the Product Selections API.
• [GraphQL API] Removed the type field from the ProductSelection type.
• [GraphQL API] Removed the input field type from the CreateProductSelectionDraft type.