Changes to POST /getBusinessAccountGifts

added the optional property allOf[subschema #2]/result/gifts/items/oneOf[#/components/schemas/OwnedGiftRegular]/entities/items/user/allOf[#/components/schemas/User]/supports_join_request_queries to the response with the 200 status

added the optional property allOf[subschema #2]/result/gifts/items/oneOf[#/components/schemas/OwnedGiftRegular]/sender_user/allOf[#/components/schemas/User]/supports_join_request_queries to the response with the 200 status

added the optional property allOf[subschema #2]/result/gifts/items/oneOf[#/components/schemas/OwnedGiftUnique]/sender_user/allOf[#/components/schemas/User]/supports_join_request_queries to the response with the 200 status