Remove PVVolumeSnapshotContentList field from the VolumeGroupSnapshotContentStatus API

[leonardoce]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change

/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

This PR removes the volumegroupsnapshotcontent.status.pvVolumeSnapshotContentList field, as requested from the KEP review.

Which issue(s) this PR fixes:

Fixes #1195

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

The `volumegroupsnapshotcontent.status.pvVolumeSnapshotContentList` field has been removed. The same information can be found in `volumegroupsnapshotcontent.status.volumeSnapshotHandlePairList`

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: leonardoce, xing-yang

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