tests: Rename to incus #20

Job	Run time
Code tests	8m 59s
Documentation tests	10m 59s
Client tests (1.18.x, ubuntu-latest)	40s
Client tests (1.18.x, macos-latest)	1m 36s
Client tests (1.18.x, windows-latest)	4m 26s
System tests (1.18.x, cluster, dir)	14m 17s
System tests (1.18.x, cluster, btrfs)	17m 0s
System tests (1.18.x, cluster, lvm)	13m 56s
System tests (1.18.x, cluster, zfs)	14m 10s
System tests (1.18.x, cluster, ceph)	20m 30s
System tests (1.18.x, cluster, random)	15m 47s
System tests (1.18.x, standalone, dir)	22m 19s
System tests (1.18.x, standalone, btrfs)	24m 28s
System tests (1.18.x, standalone, lvm)	38m 40s
System tests (1.18.x, standalone, zfs)	45m 59s
System tests (1.18.x, standalone, ceph)	1h 12m 47s
System tests (1.18.x, standalone, random)	33m 43s
System tests (stable, cluster, dir)	13m 51s
System tests (stable, standalone, dir)	21m 46s
System tests (tip, cluster, dir)	13m 30s
System tests (tip, standalone, dir)	24m 47s
	7h 14m 10s

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