Adding Support For VolumeAttributes in Resource Policy

[mayankagg9722]

Thank you for contributing to Velero!

Summary of your changes

Currently Velero Resource policies are only supporting "Driver" to be filtered in CSI volume conditions

We are adding support for filtering Persistent Volumes (PVs) based on additional VolumeAttributes properties under CSI PVs.

Use Case:
Customers asked to back up AFS (Azure file shares) and want to only backup SMB type of file share volumes and not NFS file share volumes.

How Provisioning happens:
Define the Storage class with protocol: nfs under storage class parameters to provision CSI NFS Azure File Shares.

Link: https://learn.microsoft.com/en-us/azure/aks/azure-files-csi#nfs-file-shares

The same protocol:nfs property will be floated to the PersistentVolumes as part of CSI VolumeAttributes.

Constraints with current Velero Resource Policies:
As the current resource policies only offer to filter based on the driver type, we are bringing an additional filter VolumeAttributes to extend and allow customer to skip/snapshot only certain types of persistent volumes for the same driver.

Sample AFS NFS PV attached below:

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• Updated the corresponding documentation in site/content/docs/main.