Ignore items returned by ItemSnapshotter.AlsoHandles during backup

[dsu-igeek]

Describe the problem/challenge you have
Complex objects handled by ItemSnapshotter may have subsidiary objects that the ItemSnapshotter will handle that Velero proper should ignore. For example, in the case of a VM managed via Kubernetes, the may be a VM resource handled by ItemSnapshotter as well as multiple PVs which are also handled as part of the VM (VM snapshot causes PV snapshots to occur). The ItemSnapshotter plugin API provides the AlsoHandles() method which returns any additional resources that would be handled. These resources need to be excluded from the backup.

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