all: introduce syz_usb_finish_probe to improve usb driver fuzzing #18265

Job	Run time
dashboard	2m 7s
aux	3m 42s
race	7m 19s
build	3m 18s
arch (presubmit_arch_windows)	3m 36s
arch (presubmit_arch_freebsd)	6m 31s
arch (presubmit_arch_netbsd)	3m 53s
arch (presubmit_arch_darwin)	3m 49s
gvisor	3m 50s
race_dashboard	4m 24s
arch (presubmit_arch_openbsd)	3m 52s
arch (presubmit_arch_linux)	10m 38s
arch (presubmit_arch_executor)	3m 16s
old	7m 12s
	1h 7m 27s

Provide feedback