fuzzing: Improve testcase isolation by draining the IPC staging queue #23398

Job	Run time
manifest-check	2m 26s
build-windows (mnfst, lnl)	8m 26s
build-windows (mnfst, ptl)	10m 33s
LP64-WIP	4m 4s
build-linux (mnfst, lnl)	4m 18s
build-windows (mnfst, tgl-h)	8m 0s
build-linux (mnfst, imx8m imx8ulp)	5m 2s
build-windows (mnfst, mtl)	9m 33s
build-windows (-d, mnfst, lnl)	8m 45s
build-linux (-d, mnfst, lnl)	4m 40s
build-linux (mnfst, tgl)	4m 10s
build-linux (mnfst, ptl)	5m 44s
build-windows (mnfst, tgl)	8m 55s
build-windows (mnfst, imx8m imx8ulp)	10m 58s
build-linux (mnfst, imx8 imx8x)	4m 50s
build-linux (mnfst, wcl imx95)	7m 15s
build-linux (mnfst, mtl)	4m 25s
build-linux (mnfst, tgl-h)	3m 53s
build-windows (mnfst, imx8 imx8x)	9m 50s
compare-linux-win	32s
	2h 6m 19s

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