Add validation for additionalDisks #6705

Job	Run time
Colima tests (QEMU, Linux host) (v0.6.5)	16m 22s
Lints	4m 59s
Integration tests (QEMU, macOS host)	9m 45s
Integration tests (QEMU, Linux host) (alpine.yaml)	3m 2s
Integration tests (QEMU, Linux host) (debian.yaml)	4m 48s
Spell check	12s
Unit tests (1.22.x)	1m 6s
Upgrade tests (QEMU, macOS host) (v0.15.1)	8m 58s
Integration tests (QEMU, Linux host) (fedora.yaml)	4m 11s
Unit tests (1.23.x)	1m 4s
Integration tests (QEMU, Linux host) (archlinux.yaml)	6m 22s
VMNet tests (QEMU)	7m 52s
Integration tests (vz) (default.yaml, true)	10m 11s
Windows tests	6m 34s
Integration tests (vz) (fedora.yaml, false)	9m 22s
Integration tests (QEMU, Linux host) (opensuse.yaml)	6m 35s
Integration tests (QEMU, Linux host) (docker.yaml)	4m 15s
Integration tests (QEMU, Linux host) (../hack/test-templates/alpine-iso-9p-writable.yaml)	2m 38s
Integration tests (QEMU, Linux host) (../hack/test-templates/net-user-v2.yaml)	5m 42s
Integration tests (QEMU, Linux host) (../hack/test-templates/test-misc.yaml)	18m 2s
	2h 12m 0s

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