Update mentions of testgrid dashboard link

[Adaminite]

Updated mentions of k8s-testgrid.appspot.com to testgrid.k8s.io

Attempts to fix kubernetes/test-infra#30370

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[k8s-ci-robot]

Hi @Adaminite. Thanks for your PR.

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[rjsadow]

/ok-to-test
/lgtm
Thanks!

[letmerecall]

duplicate of #331

[letmerecall]

Also, this won't fix the mentioned issue in the description. It only completes a subtask of it.

[adrianludwin]

Thanks for this!

/approve
/lgtm
/ok-to-test

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Adaminite, adrianludwin

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