http: harden ClientRequest options merge #6280

Job	Run time
Build slim tarball	1m 9s
aarch64-linux: Cache V8 build	25s
x86_64-linux: with shared libraries	31m 17s
x86_64-darwin: with shared libraries	39m 32s
aarch64-darwin: with shared libraries	28m 1s
aarch64-linux: with shared openssl-3.5.5	23m 33s
aarch64-linux: with shared openssl-4.0.0	23m 28s
aarch64-linux: with shared openssl-3.0.19	23m 44s
aarch64-linux: with shared openssl-1.1.1w	23m 5s
aarch64-linux: with shared openssl-3.6.1	23m 32s
	3h 37m 46s

Provide feedback