Move docker reverse proxy to api node pool

[jakubno]

Note

Switches docker_reverse_proxy Nomad job to use var.api_node_pool instead of var.builder_node_pool.

• Infra (Nomad/Terraform):
  • iac/provider-gcp/nomad/main.tf
    • docker_reverse_proxy job: set node_pool to var.api_node_pool (from var.builder_node_pool).

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