Changes to Update an agent identity

added the new optional request property allowed_resources

added the new optional request property allowed_servers

added the new optional request property entitlements

added the new optional request property preapproved_mutating_tools

added the optional property code to the response with the 400 status

added the optional property code to the response with the 401 status

added the optional property code to the response with the 403 status

added the optional property code to the response with the 404 status

added the optional property code to the response with the 503 status

endpoint added