fuzzing: Improve testcase isolation by draining the IPC staging queue #23308

Job	Run time
LP64-WIP	3m 52s
manifest-check	2m 44s
build-windows (mnfst, ptl)	9m 49s
build-windows (mnfst, tgl)	9m 35s
build-linux (mnfst, ptl)	5m 55s
build-linux (mnfst, mtl)	4m 42s
build-windows (mnfst, mtl)	9m 48s
build-windows (mnfst, lnl)	10m 58s
build-windows (mnfst, imx8m imx8ulp)	11m 7s
build-linux (mnfst, imx8 imx8x)	4m 48s
build-windows (mnfst, imx8 imx8x)	11m 12s
build-windows (mnfst, tgl-h)	11m 30s
build-linux (mnfst, tgl)	4m 35s
build-linux (mnfst, imx8m imx8ulp)	4m 53s
build-linux (-d, mnfst, lnl)	4m 28s
build-linux (mnfst, lnl)	4m 44s
build-windows (-d, mnfst, lnl)	10m 7s
build-linux (mnfst, wcl imx95)	7m 16s
build-linux (mnfst, tgl-h)	4m 6s
compare-linux-win	28s
	2h 16m 37s

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