Ensure ACM only has certificates with single domain names, and none with wildcard domain names

Checks for ACM Certificates with wildcard domain names instead of single domain names. ACM allows you to use wildcards (*) in the domain name, to protect several sites in the same domain. There is a risk with this type of certificate, since if the private key of a certificate is compromised, then all domain and subdomains that use the compromised certificate are potentially compromised. It is recommended to use single domain name certificates instead of wildcard certificates to reduce these associated risks.