PackageToJS: Add selectable UWASI runtime #2826

Job	Run time
Build for native target (macos-15, Xcode_26.0.1)	2m 19s
check-bridgejs-generated	2m 45s
prettier	2m 38s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 26s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 47s
build-examples (PlayBridgeJS)	2m 45s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	2m 38s
format	35s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	2m 45s
build-examples (Embedded)	2m 38s
build-examples (OffscrenCanvas)	2m 41s
build-examples (Basic)	2m 46s
build-examples (ActorOnWebWorker)	2m 46s
build-examples (Multithreading)	2m 45s
build-examples-deploy	-1s
deploy-examples	-1s
	35m 12s

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