test: fix flaky test-watch-mode-inspect timeout #6787

Job	Run time
Build slim tarball	1m 13s
aarch64-linux: Cache V8 build	23s
x86_64-linux: with shared libraries	27m 29s
x86_64-darwin: with shared libraries	34m 40s
aarch64-darwin: with shared libraries	23m 29s
aarch64-linux: with shared openssl-3.5.5	23m 15s
aarch64-linux: with shared openssl-4.0.0	23m 3s
aarch64-linux: with shared boringssl-0.20260413.0	23m 7s
aarch64-linux: with shared openssl-1.1.1w	22m 51s
aarch64-linux: with shared openssl-3.0.19	22m 25s
aarch64-linux: with shared openssl-3.6.1	23m 34s
	3h 45m 29s

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