change from disks.createSnapshot to snapshots.insert

[amacaskill]

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/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

Which issue(s) this PR fixes:

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[k8s-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amacaskill

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[k8s-ci-robot]

@amacaskill: 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
pull-gcp-compute-persistent-disk-csi-driver-unit	384ffcc	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-unit
pull-gcp-compute-persistent-disk-csi-driver-verify	384ffcc	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-verify
pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration	384ffcc	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-kubernetes-integration
pull-gcp-compute-persistent-disk-csi-driver-e2e	384ffcc	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-e2e
pull-gcp-compute-persistent-disk-csi-driver-sanity	384ffcc	link	true	/test pull-gcp-compute-persistent-disk-csi-driver-sanity

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.