Add additional disk types

[barbacbd]

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What type of PR is this?

/kind api-change

What this PR does / why we need it: There are missing disk types that are used by downstream services. This PR adds the pd-balanced and hyperdisk-balanced disk types so that others can create machines with these disk types.

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• [x] squashed commits
• [ ] includes documentation
• [ ] adds unit tests

Release note:

Add the ability to use the pd-balanced and hyperdisk-balanced for the root device type and the addition disks.

[k8s-ci-robot]

Hi @barbacbd. Thanks for your PR.

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[JoelSpeed]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: barbacbd, cpanato

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[damdo]

LGTM so far.

@barbacbd would you be also able to update the experimental MachinePool to export/support this new disk type? Thanks.

https://github.com/kubernetes-sigs/cluster-api-provider-gcp/blob/e6db2b72de1e436da4b14fd3fd1f97ea92de1395/exp/api/v1beta1/gcpmanagedmachinepool_types.go#L32-L42

Other than that I think I'm happy with it and we can move this forward, adding the validation breaking change later down the line.

[damdo]

@cpanato happy to remove the hold and get this merged?