[ci] mark blackwell test optional for now

[simon-mo]

blackwell node is still in development

[github-actions]

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[gemini-code-assist]

Code Review

This pull request marks the Blackwell test as optional in the CI pipeline. This is a reasonable temporary measure while the Blackwell node is under development. My feedback is to add a TODO comment to track the work required to make this test mandatory again, which will prevent potential regressions from going unnoticed in the long term.

[gemini-code-assist]

To ensure this temporary change isn't forgotten, it would be beneficial to add a TODO comment. This will help track the work needed to make the test mandatory once Blackwell support is stable, preventing potential regressions from being missed.

  # TODO: Make this test non-optional once Blackwell support is stable.
  optional: true