Add cloud-platform GCP VM scope

[sl1pm4t]

This changes adds the cloud-platform scope to the GCP instances created by kOps.
This is the Google recommended best practice, and it allows setting instance permissions via the IAM roles granted to the Service Account associated with the VM.

Also, code comments in kops indicate this a desirable change.

In our case, we needed the bastion nodes to be able to read secrets out of Google Secret Manager, which the current VM scopes wouldn't have allowed.

Closes #11768

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: sl1pm4t / name: Matt Morrison (0be2499, 9f15dd7)

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[k8s-ci-robot]

Hi @sl1pm4t. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[zetaab]

/ok-to-test

[sl1pm4t]

/retest

[sl1pm4t]

/retest-required

[hakman]

Thanks @sl1pm4t! 😄
/lgtm
/ok-to-test
/cc @justinsb
/assign @justinsb
/kind office-hours

[hakman]

/retest

[justinsb]

Thanks for bringing us out of scope era @sl1pm4t - this is a good change :-)

We had some discussion about whether we should drop the other scopes (as they're included in the new scope); they seem harmless and it's probably a good idea to be explicit in case anyone is looking for those particular scope values.

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb

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[justinsb]

/test pull-kops-e2e-k8s-gce-cilium