Test parallel downloads #5894

Job	Run time
Colima (v0.6.5)	8m 16s
Integration tests (on Linux) (alpine.yaml)	6m 7s
Integration tests	14m 11s
Integration tests (on Linux) (debian.yaml)	6m 21s
Lints	2m 0s
Integration tests (on Linux) (fedora.yaml)	6m 30s
Unit tests (1.22.x)	44s
Upgrade test (v0.15.1)	12m 18s
Integration tests (on Linux) (opensuse.yaml)	8m 45s
Integration tests (on Linux) (experimental/net-user-v2.yaml)	10m 14s
VMNet test	10m 20s
Unit tests (1.23.x)	4m 8s
Integration tests (on Linux) (experimental/9p.yaml)	6m 39s
vz (default.yaml)	10m 31s
Integration tests (on Linux) (docker.yaml)	13m 25s
vz (fedora.yaml)	9m 39s
Windows tests	4m 9s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	5m 50s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	19m 48s
	2h 39m 55s

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