feat: add cloud_engine testnet type

[severin-amrein]

Summary

• Add a new cloud_engine testnet with a 4-node System/NNS subnet, a 4-node CloudEngine subnet (1 node per DC across 4 datacenters), and 4 unassigned nodes (1 per DC)
• Extend the InternetComputer builder to support adding data center records and node operator entries directly to the initial registry
• Allow per-node node_operator_principal_id assignment so nodes can be associated with different datacenters in the registry

Test plan

• Spin up testnet with ict testnet create cloud_engine and verify all nodes boot

./ci/container/container-run.sh ict testnet create cloud_engine --no-ttl --set-required-host-features=dmz --output-dir=./cloud_engine -- --test_env=DKG_INTERVAL=49 --test_tmpdir=./cloud_engine

• Verify registry shows correct DC assignments for CloudEngine and unassigned nodes

   "subnets": [
      {
        "nodes": [
          {
            "domain": null,
            "id": "k5bj4-rb74n-okfhd-5x55f-6deqk-ckyr7-qkcs4-6ggiw-ym243-yyd5i-vqe",
            "ipv6": "2602:fb2b:100:101:50aa:90ff:fe0b:54d9"
          },
...
        ],
        "subnet_id": "nz4w2-jqn3j-zmcxx-4gvov-wlahu-b2w22-slhas-vi2cx-uxf2i-hbdeu-oqe",
        "subnet_type": "system"
      },
      {
        "nodes": [
          {
            "domain": null,
            "id": "wjyiu-z5ymc-g2pkl-6hwh2-2tyqa-aqbyc-chblx-sdeqo-olgn5-wu547-gae",
            "ipv6": "2602:fb2b:100:101:5083:ceff:fed5:5b45"
          },
...
        ],
        "subnet_id": "qdknn-usgac-6vtgi-2obfr-lhgz4-yuspz-vjwgd-j56k4-3absf-6yqta-kqe",
        "subnet_type": "cloud_engine"
      }
    ],
    "unassigned_nodes": [
      {
        "domain": null,
        "id": "ajy3v-y4g6a-s47rf-xnnvd-h4pg5-pq5r5-ml7db-xyzso-2s35e-qrcv2-lae",
        "ipv6": "2602:fb2b:100:101:50c7:76ff:fe4c:2a78"
      },
...
    ]
  },

• Get DC information via backend

{
  "data_centers": [
    {
      "id": "dc1",
      "region": "us-west-1",
      "owner": "owner1",
      "gps": {
        "latitude": 37.7749,
        "longitude": -122.4194
      }
    },
    {
      "id": "dc2",
      "region": "eu-west-1",
      "owner": "owner2",
      "gps": {
        "latitude": 53.3498,
        "longitude": -6.2603
      }
    },
    {
      "id": "dc3",
      "region": "ap-east-1",
      "owner": "owner3",
      "gps": {
        "latitude": 22.3193,
        "longitude": 114.1694
      }
    },
    {
      "id": "dc4",
      "region": "us-east-1",
      "owner": "owner4",
      "gps": {
        "latitude": 39.0438,
        "longitude": -77.4874
      }
    }
  ],
  "total": 4
}

[Copilot]

Pull request overview

Adds a new cloud_engine dynamic testnet configuration and extends the system-test InternetComputer builder / ic-prep plumbing to seed data center + node operator records into the initial registry and support per-node node-operator assignment.

Changes:

• Introduces rs/tests/testnets/cloud_engine.rs testnet topology (System/NNS subnet + CloudEngine subnet distributed across 4 DCs + unassigned nodes) and wires it into Cargo/Bazel.
• Extends InternetComputer (system-test driver) with add_data_center, add_node_operator, and per-node node_operator_principal_id.
• Extends ic-prep (IcConfig) to accept initial DC records and node operator entries and to avoid overwriting per-node operator IDs when applying the initial operator.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
rs/tests/testnets/cloud_engine.rs	New dynamic testnet definition, including DC + node operator seeding and per-node operator assignment.
rs/tests/testnets/Cargo.toml	Adds deps and registers the new cloud_engine binary.
rs/tests/testnets/BUILD.bazel	Adds a system_test_nns Bazel target for cloud_engine with required runtime deps.
rs/tests/driver/src/driver/ic.rs	Extends InternetComputer/Node builder types to support DC/operator registry seeding and per-node operator IDs.
rs/tests/driver/src/driver/bootstrap.rs	Plumbs DC/operator entries into IcConfig and passes per-node operator IDs into NodeConfiguration.
rs/prep/src/internet_computer.rs	Updates initial-node-operator behavior and adds IcConfig APIs to inject DC/node-operator registry entries.
Cargo.lock	Updates lockfile for new direct crate deps.

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