incusd/storage/drivers/btrfs: Skip nodatacow on compressed pools #232

Job	Run time
Documentation	9m 35s
Code	9m 13s
System (1.20.x, cluster, dir)	13m 19s
Client (1.20.x, ubuntu-latest)	1m 8s
System (1.20.x, cluster, btrfs)	12m 15s
System (1.20.x, cluster, lvm)	13m 6s
Client (1.20.x, macos-latest)	1m 13s
System (1.20.x, cluster, zfs)	13m 15s
Client (1.20.x, windows-latest)	2m 10s
System (1.20.x, cluster, ceph)	13m 18s
System (1.20.x, cluster, random)	12m 48s
System (1.20.x, standalone, dir)	13m 16s
System (1.20.x, standalone, btrfs)	13m 18s
System (1.20.x, standalone, lvm)	13m 15s
System (1.20.x, standalone, zfs)	13m 19s
System (1.20.x, standalone, ceph)	13m 7s
System (1.20.x, standalone, random)	13m 18s
System (stable, cluster, dir)	13m 17s
System (stable, standalone, dir)	13m 15s
System (tip, cluster, dir)	13m 15s
System (tip, standalone, dir)	13m 16s
	3h 53m 56s

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