Removes the specified user from the specified group.
cognitoidentityprovider_admin_remove_user_from_group(UserPoolId,
Username, GroupName)
[required] The user pool ID for the user pool.
[required] The username for the user.
[required] The group name.
svc$admin_remove_user_from_group( UserPoolId = "string", Username = "string", GroupName = "string" )
Requires developer credentials.