test(sagemaker): add HyperPod E2E tests

[aws-ajangg]

Problem

• HyperPod SSH connection flows have no end-to-end test coverage against real AWS infrastructure. There's no automated way to verify that the full chain (authenticate → list clusters → kubectl → workspace connection) works correctly.

Solution

• Add E2E tests for HyperPod SSH connections that exercise real AWS APIs (SageMaker, EKS, K8s).

3 tests covering critical user journeys:

• Side panel → list spaces and verify status
• Side panel → connect to running space → workspace connection established
• Deeplink → connect to running space → workspace connection established

Tests skip gracefully when prerequisites (credentials, clusters, running spaces) are not met.

How to run

ada credentials update --account= --provider=isengard --role=Admin --once --profile=
eval "$(AWS_PROFILE= aws configure export-credentials --format env)"
AWS_DEFAULT_REGION= TEST_DIR="../../core/dist/src/testE2E/sagemaker" npm run testE2E -w packages/toolkit

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[amazon-inspector-ohio]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[amazon-inspector-ohio]

✅ I finished the code review, and didn't find any security or code quality issues.