Test user-space and enable CONFIG_USERSPACE on select platforms #21336

Job	Run time
LP64-WIP	4m 18s
build-windows (mtl lnl)	13m 2s
build-windows (tgl tgl-h)	10m 45s
manifest-check	53s
build-windows (imx8 imx8x imx8m imx8ulp)	14m 26s
build-linux (mnfst, tgl tgl-h)	5m 25s
build-windows (ptl)	7m 3s
build-linux (mnfst, mtl lnl)	6m 24s
build-linux (zmain, imx8 imx8x imx8m imx8ulp)	6m 29s
build-linux (zmain, mtl lnl)	5m 41s
build-linux (mnfst, ptl)	3m 29s
build-linux (mnfst, imx8 imx8x imx8m imx8ulp)	6m 58s
build-windows (-d, lnl)	9m 12s
build-linux (zmain, ptl)	3m 53s
build-linux (-d, mnfst, lnl)	4m 28s
build-linux (mnfst, --all)	8m 20s
build-linux (zmain, tgl tgl-h)	5m 43s
compare-linux-win	2m 13s
	1h 58m 42s

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