incusd: Fill ExpiryDate and remove LastUsedDate in volumeSnapshotToProtobuf #3149

Job	Run time
Documentation	5m 39s
Client (oldstable, ubuntu-latest)	1m 9s
Code (oldstable)	7m 36s
Client (oldstable, macos-latest)	1m 12s
Code (stable)	7m 53s
Client (oldstable, windows-latest)	3m 7s
Code (tip)	10m 27s
System (stable, cluster, dir)	12m 6s
Client (stable, ubuntu-latest)	1m 10s
System (stable, cluster, btrfs)	13m 59s
Client (stable, macos-latest)	1m 14s
System (stable, cluster, lvm)	14m 22s
Client (stable, windows-latest)	2m 50s
System (stable, cluster, zfs)	14m 36s
System (stable, cluster, ceph)	16m 3s
System (stable, cluster, random)	11m 50s
System (stable, standalone, dir)	23m 19s
System (stable, standalone, btrfs)	22m 25s
System (stable, standalone, lvm)	41m 24s
System (stable, standalone, zfs)	38m 41s
System (stable, standalone, ceph)	1h 15m 59s
System (stable, standalone, random)	23m 46s
System (oldstable, cluster, dir)	11m 40s
System (oldstable, standalone, dir)	22m 36s
System (tip, cluster, dir)	15m 58s
System (tip, standalone, dir)	25m 13s
	7h 6m 14s

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