faster JSObjectSpace (JS runtime retain / release) #2409

Job	Run time
build-examples	1m 46s
format	35s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	1m 36s
Build for native target (macos-15, Xcode_16.4)	1m 48s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	1m 35s
prettier	8s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	1m 48s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	1m 46s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1m 48s
check-bridgejs-generated	1m 46s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	1m 46s
deploy-examples	1s
	16m 23s

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