tests: Add test for custom storage volume snapshots pattern #690

Job	Run time
Documentation	7m 21s
Code (oldstable)	17m 51s
Client (oldstable, ubuntu-latest)	1m 5s
Code (stable)	7m 39s
System (stable, cluster, dir)	12m 53s
Client (oldstable, macos-latest)	1m 5s
Code (tip)	10m 5s
System (stable, cluster, btrfs)	11m 58s
Client (oldstable, windows-latest)	2m 45s
System (stable, cluster, lvm)	12m 41s
Client (stable, ubuntu-latest)	1m 8s
System (stable, cluster, zfs)	13m 38s
Client (stable, macos-latest)	1m 21s
Client (stable, windows-latest)	1m 26s
System (stable, cluster, ceph)	15m 52s
System (stable, cluster, random)	11m 50s
System (stable, standalone, dir)	22m 14s
System (stable, standalone, btrfs)	21m 59s
System (stable, standalone, lvm)	39m 59s
System (stable, standalone, zfs)	38m 27s
System (stable, standalone, ceph)	1h 16m 26s
System (stable, standalone, random)	29m 19s
System (oldstable, cluster, dir)	11m 51s
System (oldstable, standalone, dir)	22m 20s
System (tip, cluster, dir)	15m 59s
System (tip, standalone, dir)	26m 5s
	7h 15m 17s

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