Support Neuron based GPUs for AL2023

[flostadler]

Currently, the AMI selection in pulumi-eks is only architecture-aware (x86_64, ARM64). However, AWS has recently released EKS-optimized AMIs specifically for Neuron-based instances (trn1, inf1, etc.). To properly support these instance types, the AMI selection logic needs to be extended to be instance type-aware.

Going forward, the AMI selection should consider the instance type when choosing the appropriate AMI
For Neuron-capable instances (trn1, inf1), it should select the Neuron-optimized AMI, otherwise when GPU support is enabled it should select the NVIDIA-based AMI and for all other instances it should use the regular EKS optimized AMIs.

For more details, see AWS docs.