Install gcloud from rpm on gce rhel8

[mboersma]

Change description

Fixes #1516 by installing gcloud from an RPM rather than a script if the distro is RedHat.

Related issues

• Fixes RHEL 8 build broken for GCE #1516

Additional context

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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[mboersma]

/test pull-image-builder-gcp-all

[mboersma]

/test pull-image-builder-gcp-all

Looks like this fixed it. I'm just moving the symlink step inside the "!= RedHat" block.

[mboersma]

This does fix #1516, but we may need #1604 to merge before it will pass.

[AverageMarcus]

/lgtm

[mboersma]

/retest

[AverageMarcus]

@mboersma this one good to merge in now? Need an approve?

[mboersma]

@AverageMarcus should be good to go, yes thanks.

[AverageMarcus]

/approve

[k8s-ci-robot]

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