fix infra hyperdisk migration

[nicu-da]

[static]

fix a missed storage class and change the name for the prometheus/alertmanager pvcs

Pull Request Checklist

Cluster Testing

• If a cluster test is required, comment /cluster_test on this PR to request it, and ping someone with access to the DA-internal system to approve it.
• If a hard-migration test is required (from the latest release), comment /hdm_test on this PR to request it, and ping someone with access to the DA-internal system to approve it.

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