faster JSObjectSpace (JS runtime retain / release) #2410

Job	Run time
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 25s
prettier	13s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	6h 5m 1s
check-bridgejs-generated	2m 52s
format	33s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	6h 5m 0s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6h 5m 0s
build-examples	20m 17s
Build for native target (macos-15, Xcode_16.4)	4m 3s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 0s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	6h 5m 1s
deploy-examples	0s
	1d 0h 54m 25s

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