userspace: proxy: use a separate worker per core #23731

Job	Run time
LP64-WIP	3m 40s
manifest-check	2m 51s
build-windows (mnfst, imx8 imx8x)	9m 32s
build-windows (mnfst, lnl)	9m 8s
build-windows (-d, mnfst, lnl)	7m 44s
build-windows (mnfst, imx8m imx8ulp)	9m 44s
build-linux (mnfst, imx8m imx8ulp)	4m 34s
build-windows (mnfst, ptl)	9m 56s
build-linux (mnfst, ptl)	5m 27s
build-linux (mnfst, lnl)	4m 11s
build-linux (mnfst, imx8 imx8x)	4m 27s
build-linux (-d, mnfst, lnl)	4m 22s
build-windows (mnfst, tgl-h)	7m 35s
build-windows (mnfst, tgl)	7m 43s
build-linux (mnfst, tgl)	4m 2s
build-linux (mnfst, tgl-h)	3m 56s
build-linux (mnfst, mtl)	4m 2s
build-linux (mnfst, wcl imx95)	5m 34s
build-windows (mnfst, mtl)	10m 0s
compare-linux-win	28s
	1h 58m 56s

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