Remove INCUS_UNPRIVILEGED_ONLY #132

Job	Run time
Code tests	8m 52s
Client tests (1.18.x, ubuntu-latest)	20s
Client tests (1.18.x, macos-latest)	38s
Client tests (1.18.x, windows-latest)	4m 37s
Documentation tests	9m 3s
System tests (1.18.x, cluster, dir)	14m 23s
System tests (1.18.x, cluster, btrfs)	13m 3s
System tests (1.18.x, cluster, lvm)	13m 53s
System tests (1.18.x, cluster, zfs)	13m 18s
System tests (1.18.x, cluster, ceph)	19m 10s
System tests (1.18.x, cluster, random)	16m 33s
System tests (1.18.x, standalone, dir)	21m 30s
System tests (1.18.x, standalone, btrfs)	23m 35s
System tests (1.18.x, standalone, lvm)	42m 9s
System tests (1.18.x, standalone, zfs)	41m 41s
System tests (1.18.x, standalone, ceph)	1h 9m 8s
System tests (1.18.x, standalone, random)	31m 17s
System tests (stable, cluster, dir)	11m 23s
System tests (stable, standalone, dir)	20m 23s
System tests (tip, cluster, dir)	12m 50s
System tests (tip, standalone, dir)	23m 0s
	6h 50m 46s

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