Changes to Accept invitation for operator user

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

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

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

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

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

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

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

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

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

added the optional property security to the response with the 500 status