Sends an activation code to a contact channel. The contact can use this code to activate the contact channel in the console or with the ActivateChannel
operation. Incident Manager can't engage a contact channel until it has been activated.
See https://www.paws-r-sdk.com/docs/ssmcontacts_send_activation_code/ for full documentation.
ssmcontacts_send_activation_code(ContactChannelId)
[required] The Amazon Resource Name (ARN) of the contact channel.