Changes to Generate presigned upload URL for vault file

the response property instructions became nullable for the status 200

the response property uploadUrl became nullable for the status 200

added the new optional header request parameter Idempotency-Key

added the new optional request property file_origin

added the new optional request property is_ai_generated

the sizeBytes request property's min was decreased from 1.00 to 0.00

added the non-success response with the status 409

added the optional property alreadyUploaded to the response with the 200 status

added the optional property file_origin to the response with the 200 status

added the optional property is_ai_generated to the response with the 200 status