[WIP] Clean-up storage specific functions in tests/utils.go

[alromeros]

What this PR does

This PR aims to clean-up most of the storage-specific functions in tests/utils.go, so we move the logic to the specific tests instead of branching the setup.

In progress. Want to clean-up the commits a bit.

Fixes #

Release note

NONE

[alromeros]

/test all

[kubevirt-bot]

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[kubevirt-bot]

@alromeros: 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-kubevirt-e2e-k8s-1.30-sig-compute-migrations	8bac51c	link	true	/test pull-kubevirt-e2e-k8s-1.30-sig-compute-migrations
pull-kubevirt-e2e-k8s-1.30-sig-storage	8bac51c	link	true	/test pull-kubevirt-e2e-k8s-1.30-sig-storage

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[alromeros]

Opening a new PR to arrange the commits a bit better.