Backport of CSI: minor refactoring into release/1.2.x #12641
Merged
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Backport
This PR is auto-generated from #12105 to be assessed for backporting due to the inclusion of the label backport/1.2.x.
The below text is copied from the body of the original PR.
While working on #8609 I ended up having two minor refactors, which I want to keep out of the PR for that bug because it'll make it harder to review:
(*CSIVolume) WriteFreeClaims
toHasFreeWriteClaims
(*CSIVolume) Claim
Marking this as needing backports because the backported patches for #8609 will be built on this code as well.