security/public_certs CertificateNode has overly broad permissions

[manics]

The InstanceRole for the CertificateNode in security/public_certs has administrative permissions:

aws-hpc-recipes/recipes/security/public_certs/assets/main.yaml

Lines 100 to 105 in 8410cf4

	- PolicyDocument:
	Statement:
	- Action: '*'
	Effect: Allow
	Resource: '*'
	PolicyName: All

Presumably left-over from development?