crypto: refactor keyObject.toCryptoKey() and SubtleCrypto.getPublicKey() #7787

Job	Run time
Build slim tarball	1m 11s
aarch64-linux: Cache V8 build	22s
aarch64-darwin: with shared libraries	26m 10s
x86_64-darwin: with shared libraries	36m 37s
x86_64-linux: with shared libraries	27m 29s
aarch64-linux: with shared openssl-3.5.6	23m 37s
aarch64-linux: with shared openssl-3.0.20	24m 19s
aarch64-linux: with shared openssl-4.0.0	23m 36s
aarch64-linux: with shared openssl-3.6.2	23m 59s
aarch64-linux: with shared openssl-1.1.1w	23m 18s
aarch64-linux: with shared boringssl-0.20260526.0	23m 32s
	3h 54m 10s

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