inspector: return errors when CDP protocol event emission fails #4288

Job	Run time
Build slim tarball	2m 1s
x86_64-linux: with shared libraries	21m 15s
x86_64-darwin: with shared libraries	32m 8s
aarch64-linux: with shared libraries	18m 16s
aarch64-darwin: with shared libraries	20m 43s
	1h 34m 23s

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