Changes to Accept invitation for operator user

removed the optional property security from the response with the 400 status

removed the optional property security from the response with the 404 status

removed the optional property security from the response with the 500 status

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

added the new ALREADY_REGISTERED enum value to the invitationStatus response property for the response status 200

added the new ALREADY_REGISTERED_SET_PASSWORD_ONLY enum value to the invitationStatus response property for the response status 200

added the new PENDING_TO_REGISTERED_SET_PASSWORD_ONLY enum value to the invitationStatus response property for the response status 200

added the new PENDING_TO_REGISTERED_SET_REGISTER_FORM enum value to the invitationStatus response property for the response status 200

added the new PENDING_TO_REGISTERED_SET_REGISTER_FORM_NO_PASSWORD enum value to the invitationStatus response property for the response status 200

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

removed the PENDING_USER_ENABLE enum value from the invitationStatus response property for the response status 200

removed the PENDING_USER_REGISTRATION enum value from the invitationStatus response property for the response status 200

removed the PENDING_USER_REGISTRATION_NO_PASSWORD enum value from the invitationStatus response property for the response status 200