CI: create separate artifacts for macos-{13,14,15} #5986

Job	Run time
Spell check	14s
Unit tests (1.22.x)	54s
Unit tests (1.23.x)	4m 20s
Integration tests	15m 5s
Lints	1m 42s
Windows tests	4m 54s
Colima (v0.6.5)	7m 35s
Integration tests (on Linux) (alpine.yaml)	6m 12s
Integration tests (on Linux) (debian.yaml)	6m 17s
Integration tests (on Linux) (fedora.yaml)	6m 51s
Integration tests (on Linux) (opensuse.yaml)	8m 55s
Integration tests (on Linux) (docker.yaml)	18m 3s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	5m 39s
Integration tests (on Linux) (../hack/test-templates/net-user-v2.yaml)	7m 54s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	19m 46s
Upgrade test (v0.15.1)	12m 28s
VMNet test	26m 54s
vz (default.yaml)	10m 37s
vz (fedora.yaml)	9m 35s
	2h 53m 55s

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