test: fix watch cwd argv test flake #8357

Job	Run time
Build slim tarball	3m 9s
aarch64-linux: Cache V8 build	26s
x86_64-linux: with shared libraries	32m 27s
aarch64-darwin: with shared libraries	30m 45s
x86_64-darwin: with shared libraries	50m 46s
aarch64-linux: with shared openssl-1.1.1w	22m 46s
aarch64-linux: with shared boringssl-0.20260526.0	22m 45s
aarch64-linux: with shared openssl-4.0.1	24m 4s
aarch64-linux: with shared openssl-3.0.21	24m 22s
aarch64-linux: with shared openssl-3.6.2	23m 14s
aarch64-linux: with shared openssl-3.5.7	24m 8s
	4h 18m 52s

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