Update Direct Transfer API responses

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What does this MR do?

This MR updates the API docs for Direct Transfer responses to reflect the latest properties.

QA

QA the API response by first creating some Direct Transfer data locally if there is none already, and then doing the following curl commands.

Example endpoint returning API::Entities::BulkImport

GET api/v4/bulk_imports:

curl --location 'http://gdk.test:3000/api/v4/bulk_imports' \
--header 'Authorization: Bearer <PAT>'

These other endpoints also serialize the response using the same API entity:

• POST /bulk_imports
• POST /bulk_imports/:id/cancel

Example endpoint returning API::Entities::BulkImports::Entity

GET api/v4/bulk_imports/entities:

curl --location 'http://gdk.test:3000/api/v4/bulk_imports/entities' \
--header 'Authorization: Bearer <PAT>'

These other endpoints also serialize the response using the same API entity:

• GET api/v4/bulk_imports/:import_id/entities
• GET api/v4/bulk_imports/:import_id/entities/:entity_id

Related issues

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