new gcsweb directory download instructions

[omertuc]

See 77eee46 (#26978) for context

This commit updates the instructions to also suggest the gcloud storage CLI instead of just the gsutil CLI. The gsutil CLI seems like it's losing support? It doesn't work on Python 3.13 anymore and it doesn't seem clear when it will.

[k8s-ci-robot]

Hi @omertuc. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: omertuc
Once this PR has been reviewed and has the lgtm label, please assign thockin for approval. For more information see the Code Review Process.

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[smg247]

/lgtm

[omertuc]

Force pushed only to change the commit messages due to typos

[smg247]

/ok-to-test

[omertuc]

Forced push to fix unit-test

[smg247]

/lgtm