Merge pull request #2758 from AkihiroSuda/clean-up-experimental #5982

Job	Run time
Lints	1m 57s
Colima (v0.6.5)	7m 5s
Integration tests	14m 47s
Spell check	11s
Integration tests (on Linux) (alpine.yaml)	6m 40s
Integration tests (on Linux) (debian.yaml)	8m 38s
Unit tests (1.22.x)	46s
Integration tests (on Linux) (fedora.yaml)	7m 2s
Upgrade test (v0.15.1)	12m 41s
Unit tests (1.23.x)	4m 16s
Integration tests (on Linux) (opensuse.yaml)	7m 9s
Integration tests (on Linux) (docker.yaml)	7m 30s
VMNet test	9m 50s
vz (default.yaml)	10m 39s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	6m 9s
vz (fedora.yaml)	22m 54s
Integration tests (on Linux) (../hack/test-templates/net-user-v2.yaml)	11m 24s
Windows tests	5m 23s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	19m 47s
	2h 44m 48s

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