Use Informers for storage class lookups during provisioning and deleting

[ddebroy]

Address #253 (comment)

/assign @ddebroy

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[msau42]

/lifecycle frozen
/help

[k8s-ci-robot]

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In response to this:

/lifecycle frozen
/help

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[msau42]

/kind cleanup

[bertinatto]

/assign