Should volume formatting be included in pod startup time?

[wojtek-t]

Forked from: #657

from @msau42

This discussion also brought up an interesting point. We are not measuring provisioning time because we said that is bootstrapping behavior that only happens the first time.

We also format the filesystem the first time we mount the volume on any node and that is something this test will currently measure during pod startup. Is it something we want to include? If not, then we would need to bring up pods twice and only measure the second time

/area slo
/are clusterloader

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[wojtek-t]

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