Add hyperdisk-extreme disk type

[damdo]

Following up on the work of #1268 which introduced hyperdisk-balanced support, this PR introduces support for hyperdisk-extreme.

• Add the hyperdisk-extreme disk type for gcp machines.
• Add the test to validate the new type.

[openshift-ci]

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[danilo-gemoli]

/lgtm

[damdo]

/hold

For manual testing

[openshift-ci]

@damdo: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-openstack	f8d6936	link	false	/test e2e-openstack
ci/prow/e2e-metal-ipi	f8d6936	link	false	/test e2e-metal-ipi
ci/prow/e2e-metal-ipi-virtualmedia	f8d6936	link	false	/test e2e-metal-ipi-virtualmedia
ci/prow/e2e-vsphere-ovn	f8d6936	link	false	/test e2e-vsphere-ovn
ci/prow/e2e-vsphere-ovn-serial	f8d6936	link	false	/test e2e-vsphere-ovn-serial
ci/prow/e2e-metal-ipi-ovn-dualstack	f8d6936	link	false	/test e2e-metal-ipi-ovn-dualstack
ci/prow/e2e-vsphere-ovn-upgrade	f8d6936	link	false	/test e2e-vsphere-ovn-upgrade

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[openshift-bot]

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[openshift-bot]

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/lifecycle rotten
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