fix(scenarios): use -internal aggregate Service for TM RPC/REST endpoints

[bdchatham]

The major-upgrade scenario's bash steps (compute-target-height, resolve-proposal-id, wait-for-proposal-to-pass) curl Tendermint endpoints at per-pod Service DNS:

```
http://${SEI_DEPLOYMENT}-0.${SEI_NAMESPACE}.svc.cluster.local:26657/status
http://${SEI_DEPLOYMENT}-0.${SEI_NAMESPACE}.svc.cluster.local:1317/cosmos/...
```

On the live harbor manual run this dies with:

```
curl: (7) Failed to connect to bench-major-upgrade-X-0.nightly.svc:26657:
Could not connect to server
```

Root cause

Per-pod Services on a SeiNodeDeployment expose only the EVM ports (8545/8546). Tendermint RPC (26657) and REST (1317) are surfaced only on the deployment-scoped `-internal` aggregate Service. From a recent SND's `.status`:

```yaml
internalService:
name: bench-major-upgrade-X-internal
ports:
evmHttp: 8545
rest: 1317
rpc: 26657
perPodServices:

• name: bench-major-upgrade-X-0
  ports:
  evmHttp: 8545
  evmWs: 8546 # no 26657, no 1317
  endpoints:
  tendermintRpc: http://bench-major-upgrade-X-internal.nightly.svc:26657
  tendermintRest: http://bench-major-upgrade-X-internal.nightly.svc:1317
  ```

Fix

Three sed substitutions in `scenarios/major-upgrade.yaml`:

• L143: `${SEI_DEPLOYMENT}-0...:26657` → `${SEI_DEPLOYMENT}-internal...:26657`
• L236: `${SEI_DEPLOYMENT}-0...:1317` → `${SEI_DEPLOYMENT}-internal...:1317`
• L385: same as L236 in the wait-for-proposal-to-pass step

TM RPC/REST are stateless query endpoints so the aggregate (any healthy validator backing the Service) is the right target.

Symptom chain on the live run

• `compute-target-height` failed with curl rc=7 → exited 1
• `workflow-vars-` ConfigMap never got created
• Downstream `submit-upgrade-proposal` step's seitask-runner pod went into `CreateContainerConfigError` because its `envFrom: configMapRef` pointed at a ConfigMap that didn't exist

Single fix at the source resolves the whole cascade.

Bug count

Fix #8 in the major-upgrade-runs-end-to-end debugging chain. Same shape as several earlier ones: an assumption about the wider system that doesn't survive contact with the actual cluster. The audit's "trust but verify" principle continues to earn its keep.

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