Make guest username, uid, home directory configurable #6162

Job	Run time
Lints	3m 4s
Spell check	13s
Integration tests	12m 44s
Windows tests	4m 51s
Unit tests (1.22.x)	50s
Colima (v0.6.5)	6m 50s
Integration tests (on Linux) (alpine.yaml)	6m 26s
Unit tests (1.23.x)	4m 9s
Integration tests (on Linux) (debian.yaml)	9m 4s
Integration tests (on Linux) (fedora.yaml)	6m 56s
Upgrade test (v0.15.1)	11m 27s
VMNet test	9m 42s
Integration tests (on Linux) (archlinux.yaml)	7m 19s
Integration tests (on Linux) (opensuse.yaml)	7m 9s
vz (default.yaml)	8m 45s
Integration tests (on Linux) (docker.yaml)	7m 32s
vz (fedora.yaml)	9m 3s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	6m 2s
Integration tests (on Linux) (../hack/test-templates/net-user-v2.yaml)	7m 23s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	19m 43s
	2h 29m 12s

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