templates: add ubuntu-20.04, ubuntu-22.04 #6062

Job	Run time
Spell check	11s
Unit tests (1.22.x)	1m 32s
Unit tests (1.23.x)	4m 11s
Colima (v0.6.5)	7m 0s
Integration tests	13m 37s
Integration tests (on Linux) (alpine.yaml)	7m 45s
Integration tests (on Linux) (debian.yaml)	6m 25s
Lints	2m 4s
Windows tests	4m 27s
Integration tests (on Linux) (fedora.yaml)	7m 42s
Integration tests (on Linux) (opensuse.yaml)	6m 52s
Integration tests (on Linux) (docker.yaml)	7m 19s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	6m 16s
Integration tests (on Linux) (../hack/test-templates/net-user-v2.yaml)	7m 54s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	20m 28s
Upgrade test (v0.15.1)	11m 48s
VMNet test	9m 12s
vz (default.yaml)	9m 48s
vz (fedora.yaml)	9m 7s
	2h 23m 38s

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