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test_runner: avoid reusing V8 serializers #12689

Job	Run time
Build slim tarball	1m 45s
aarch64-linux: Cache V8 build	20s
x86_64-linux: with shared libraries and perfetto / build	34m 49s
x86_64-darwin: with shared libraries / build	47m 15s
aarch64-darwin: with shared libraries / build	30m 29s
aarch64-linux: with shared openssl-3.0.22 / build	31m 53s
aarch64-linux: with shared openssl-3.6.3 / build	31m 26s
aarch64-linux: with shared boringssl-0.20260803.0 / build	31m 21s
aarch64-linux: with shared openssl-3.5.8 / build	32m 5s
aarch64-linux: with shared openssl-4.0.2 / build	31m 7s
aarch64-linux: with shared openssl-fips-3.5.8 / build	38m 17s
	5h 10m 47s