incus: add completions for remotes and projects #1291

Job	Run time
Code	7m 2s
Documentation	7m 3s
Client (1.21.x, ubuntu-latest)	1m 9s
Client (1.21.x, macos-latest)	1m 9s
Client (1.21.x, windows-latest)	4m 10s
System (1.21.x, cluster, dir)	15m 29s
System (1.21.x, cluster, btrfs)	12m 33s
System (1.21.x, cluster, lvm)	13m 5s
System (1.21.x, cluster, zfs)	12m 42s
System (1.21.x, cluster, ceph)	17m 6s
System (1.21.x, cluster, random)	12m 15s
System (1.21.x, standalone, dir)	21m 14s
System (1.21.x, standalone, btrfs)	22m 18s
System (1.21.x, standalone, lvm)	39m 29s
System (1.21.x, standalone, zfs)	40m 18s
System (1.21.x, standalone, ceph)	1h 14m 39s
System (1.21.x, standalone, random)	29m 29s
System (stable, cluster, dir)	11m 46s
System (stable, standalone, dir)	21m 41s
System (tip, cluster, dir)	13m 9s
System (tip, standalone, dir)	21m 20s
	6h 39m 6s

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