Draft: Add HasCustomType concern for custom work item type associations

Daniyal Arshadrequested to merge
da-handle-cwit-associations into sx/integrate-system-defined-type-into-types-provider

What does this MR do and why?

Adds a HasCustomType concern that extends the HasType pattern from !219133 (merged) to handle both system-defined and custom work item types.

Key behavior

For converted custom types (custom types with converted_from_system_defined_type_identifier), we continue using work_item_type_id to maintain associations with the original system-defined type.

For pure custom types, we use work_item_custom_type_id.

This ensures consistent behavior across the codebase when dealing with type associations.

Related issues

Dependencies

This MR is based on !219133 (merged) (sx/integrate-system-defined-type-into-types-provider) and should be merged after it.

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