DNSControl prevents AKAMAICDN and CNAME on the same hostname

[hallorans-nca]

Describe the bug
The Akamai Control Panel allows users to create AKAMAICDN records with the same name as a CNAME.
DNSControl does not allow this combination.

To Reproduce
Steps to reproduce the behavior:

1. Have a zone with the following two records
   CNAME('alpha','dnscontroltest.com.au.edgesuite.net.'),
   AKAMAICDN('alpha','dnscontroltest.com.au.edgesuite.net'),
2. Run dnscontrol check
3. You will get an error similar to below

2024/05/16 14:22:02 ERROR: cannot have CNAME and AKAMAICDN record with same name: alpha.dnscontroltest.com.au

Expected behavior
dncontrol check should pass this special case, and upload both records to EdgeDNS

DNS Provider
AKAMAIEDGEDNS

Additional context
The function checkCNAMEs seems to be function is causing my issue

[tlimoncelli]

CC @edglynes

(You'll need to work around this in the checkCNAMEs() function in pkg/normalize/validate.go. It's a layering violation but sadly that's unavoidable right now.)