http: harden ClientRequest options merge #6286

Job	Run time
Build slim tarball	1m 2s
aarch64-linux: Cache V8 build	24s
x86_64-darwin: with shared libraries	37m 37s
x86_64-linux: with shared libraries	29m 24s
aarch64-darwin: with shared libraries	26m 42s
aarch64-linux: with shared openssl-1.1.1w	22m 45s
aarch64-linux: with shared openssl-3.6.1	23m 6s
aarch64-linux: with shared openssl-4.0.0	23m 7s
aarch64-linux: with shared openssl-3.0.19	22m 31s
aarch64-linux: with shared openssl-3.5.5	23m 30s
	3h 30m 8s

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