feat: Propagate `ami_type` to self-managed node group; allow using `ami_type` only #1710

Job	Run time
Collect workflow inputs	4s
Min TF pre-commit (.)	18s
Max TF pre-commit	59s
Min TF pre-commit (./examples/outposts)	25s
Min TF pre-commit (./examples/outposts/prerequisites)	17s
Min TF pre-commit (./examples/self_managed_node_group)	25s
Min TF pre-commit (./examples/user_data)	13s
Min TF pre-commit (./examples/karpenter)	28s
Min TF pre-commit (./examples/fargate_profile)	23s
Min TF pre-commit (./examples/eks_managed_node_group)	19s
Min TF pre-commit (./modules/fargate-profile)	20s
Min TF pre-commit (./modules/karpenter)	17s
Min TF pre-commit (./modules/aws-auth)	13s
Min TF pre-commit (./modules/self-managed-node-group)	16s
Min TF pre-commit (./modules/eks-managed-node-group)	19s
	5m 16s

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