fix: improve errors when trying to load VolumeSnapshotContent

[michaelbeaumont]

What type of PR is this?
/kind bug

What this PR does / why we need it:
The errors are rather misleading as is since the snapshot is clearly bound and the true source of the error is hidden.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[k8s-ci-robot]

Hi @michaelbeaumont. Thanks for your PR.

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[jsafrane]

/ok-to-test

[jsafrane]

/release-note none

[jsafrane]

/release-note-none

[jsafrane]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsafrane, michaelbeaumont

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