BridgeJS: Take ownership of source Uint8Array id in `swift_js_init_memory` #2301

Job	Run time
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 8s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 4s
check-bridgejs-generated	2m 55s
Build for native target (macos-15, Xcode_16.4)	3m 27s
build-examples	19m 57s
format	38s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	2m 38s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	2m 54s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	2m 54s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 55s
deploy-examples	0s
	44m 30s

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