Specify subnet ids for AZ 1 and 2 (a, b) for the PSN VPC peering
Specify subnet ids for AZ 1 and 2 (a, b) for the PSN VPC peering

The PSN VPN endpoint only supports availability zones A and B (i.e. eu-west-2a,
eu-west-2b). Our Terraform outputs export all 3 AZs, so we can safely remove
the 3rd one as an input.

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