Changes to Get session and chat history

the error response's property type changed from no type to string for status 404

removed the required property summary/messages/items/content from the response with the 200 status

removed the required property summary/messages/items/role from the response with the 200 status

removed the optional property request_id from the response with the 200 status

removed the optional property timestamp from the response with the 200 status

added the non-success response with the status 401

added the non-success response with the status 403

removed subschema #1 subschema #2 from the error response property oneOf list for the response status 404

the summary/messages/items/content/oneOf[subschema #2]/items/image_url/url response's property format changed from uri to no format for status 200

the summary response's property type changed from string to object for status 200

removed the optional property rag_stats from the response with the 200 status

added the optional property summary/conversation_turns to the response with the 200 status

added the optional property summary/messages to the response with the 200 status

added subschema #1 subschema #2 to the error response property oneOf list for the response status 404

the error response's property type changed from string to no type for status 404

the summary response's property type changed from object to string for status 200

removed the optional property summary/conversation_turns from the response with the 200 status

removed the optional property summary/messages from the response with the 200 status

removed the non-success response with the status 401

removed the non-success response with the status 403

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

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

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