Consider adding a default value for SnapshotMoveData

[sseago]

Describe the problem/challenge you have
For users who will always want to use VBDM for backups instead of plain CSI, they shouldn't have to specify --snapshot-move-data for every backup. We should have an install and server flag for this, similar to what we do for defaultVolumesToFsBackup

Describe the solution you'd like
We should create a server setting for a default value for SnapshotMoveData. When a backup CR does not include the spec.snapshotMoveData field, rather than treating it as false, the velero backup controller should set request.Spec.SnapshotMoveData to the default value set it to the server default value. An install option (and server flag) for --default-snapshot-move-data would need to be added, and the backup controller would supply this default value for backups that do already not specify it.

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[Lyndon-Li]

Reopen for 1.12.1