fix(sanity): volume names should be unique

[jfbus]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

A couple volume names are reused in multiple tests. This can generate conflicts between tests.

This PR changes the reused names to unique names.

Similar to #576, but with more duplicates fixed.

Which issue(s) this PR fixes:

n/a

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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/lifecycle stale

[jfbus]

/remove-lifecycle stale