CNV-41386: fix volume snapshot storage size

[upalatucci]

📝 Description

On DataSource with volume snapshot as source, just like PVC, save the volume snapshot in the store to show the size in the details.

🎥 Demo

[openshift-ci-robot]

@upalatucci: This pull request references CNV-41386 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.16.0" version, but no target version was set.

In response to this:

📝 Description

On DataSource with volume snapshot as source, just like PVC, save the volume snapshot in the store to show the size in the details.

🎥 Demo

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: metalice, upalatucci

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