faster JSObjectSpace (JS runtime retain / release) (#676) #2633

Job	Run time
Build for native target (macos-15, Xcode_16.4)	2m 55s
check-bridgejs-generated	3m 53s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 11s
format	32s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 5s
prettier	15s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 41s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 43s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 23s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	15m 24s
build-examples	21m 29s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 14s
deploy-examples	16s
	1h 38m 1s

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