http: harden ClientRequest options merge #6341

Job	Run time
Build slim tarball	1m 7s
x86_64-darwin: with shared libraries	2h 33m 19s
aarch64-darwin: with shared libraries	26m 27s
x86_64-linux: with shared libraries	30m 0s
aarch64-linux: Cache V8 build	25s
aarch64-linux: with shared openssl-3.0.19	25m 15s
aarch64-linux: with shared openssl-1.1.1w	24m 48s
aarch64-linux: with shared openssl-3.5.5	24m 50s
aarch64-linux: with shared openssl-4.0.0	24m 54s
aarch64-linux: with shared openssl-3.6.1	25m 6s
	5h 36m 11s

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