Storage: Add support for storage bucket backup (from Incus) #11739

Job	Run time
Code	10m 31s
Client (1.22.x, ubuntu-latest)	22s
Client (1.22.x, macos-latest)	24s
Documentation	4m 1s
Client (1.22.x, windows-latest)	3m 10s
System (1.22.x, cluster, dir, pull_request)	10m 22s
System (1.22.x, cluster, btrfs, pull_request)	10m 25s
System (1.22.x, cluster, lvm, pull_request)	11m 3s
System (1.22.x, cluster, zfs, pull_request)	10m 58s
System (1.22.x, cluster, ceph, pull_request)	13m 57s
System (1.22.x, cluster, random, pull_request)	10m 44s
System (1.22.x, standalone, dir, pull_request)	20m 58s
System (1.22.x, standalone, btrfs, pull_request)	23m 38s
System (1.22.x, standalone, lvm, pull_request)	6m 33s
System (1.22.x, standalone, zfs, pull_request)	39m 7s
System (1.22.x, standalone, ceph, pull_request)	15m 47s
System (1.22.x, standalone, random, pull_request)	30m 1s
System (stable, cluster, dir)	10m 27s
System (stable, standalone, dir)	21m 18s
Tiobe TICS	0s
Trigger snap edge build	0s
	4h 13m 46s

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