.github: add signed-off-by validation workflow pr-validation.yml #22885

Job	Run time
LP64-WIP	4m 11s
build-linux (mnfst, imx8m imx8ulp)	5m 9s
build-linux (mnfst, wcl imx95)	7m 39s
build-windows (-d, mnfst, lnl)	10m 13s
build-windows (mnfst, lnl)	8m 3s
build-windows (mnfst, ptl)	10m 12s
build-linux (mnfst, tgl)	4m 6s
build-linux (mnfst, mtl)	5m 6s
build-windows (mnfst, tgl-h)	8m 32s
build-windows (mnfst, imx8m imx8ulp)	10m 47s
build-linux (-d, mnfst, lnl)	4m 41s
manifest-check	3m 7s
build-windows (mnfst, tgl)	9m 6s
build-linux (mnfst, ptl)	6m 18s
build-windows (mnfst, mtl)	9m 53s
build-linux (mnfst, imx8 imx8x)	5m 8s
build-windows (mnfst, imx8 imx8x)	11m 12s
build-linux (mnfst, tgl-h)	4m 16s
build-linux (mnfst, lnl)	4m 36s
compare-linux-win	46s
	2h 13m 1s

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