NVIDIA / holodeck / 23289909761

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cluster: skip NAT Gateway creation to avoid EIP quota exhaustion

Cluster instances are placed in the public subnet with
AssociatePublicIpAddress=true, so they reach the internet directly
through the IGW. The NAT Gateway (and its EIP allocation + private
route table) are unnecessary for this topology.

Removing them from the cluster code path frees up EIP quota (AWS
limit: 5 per region in us-west-1), which was being exhausted when
multiple CI jobs ran concurrently, causing AddressLimitExceeded
errors on the rpm-rocky and rpm-al2023 E2E tests.

The private subnet is retained for future SSM endpoint use.
Single-node mode (create.go) is unchanged and continues to use
NAT Gateway for its private-subnet instances.

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

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