Makefile: Improve rebuilding #5725

Job	Run time
Integration tests	20m 54s
Colima (v0.6.5)	7m 1s
Integration tests (on Linux) (alpine.yaml)	6m 28s
Integration tests (on Linux) (debian.yaml)	7m 50s
Lints	1m 45s
Unit tests (1.22.x)	3m 39s
Integration tests (on Linux) (fedora.yaml)	6m 40s
Upgrade test (v0.15.1)	18m 1s
Unit tests (1.23.x)	3m 57s
Integration tests (on Linux) (archlinux.yaml)	8m 16s
Integration tests (on Linux) (opensuse.yaml)	6m 59s
VMNet test	15m 1s
Windows tests	4m 38s
vz (default.yaml)	14m 47s
Integration tests (on Linux) (experimental/net-user-v2.yaml)	10m 45s
vz (fedora.yaml)	16m 4s
Integration tests (on Linux) (experimental/9p.yaml)	6m 49s
Integration tests (on Linux) (docker.yaml)	7m 18s
Integration tests (on Linux) (../hack/test-templates/alpine-9p-writable.yaml)	6m 29s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	20m 44s
	3h 14m 5s

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