Deletes the attributes for a user.
cognitoidentityprovider_delete_user_attributes(UserAttributeNames,
AccessToken)
[required] An array of strings representing the user attribute names you wish to delete.
For custom attributes, you must prepend the custom:
prefix to the
attribute name.
[required] The access token used in the request to delete user attributes.
svc$delete_user_attributes( UserAttributeNames = list( "string" ), AccessToken = "string" )