BridgeJS: Support non-ConvertibleToJSValue async exported return types #2670

Job	Run time
Build for native target (macos-15, Xcode_16.4)	2m 59s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 58s
prettier	11s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 6s
format	32s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	9m 53s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	10m 4s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 0s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	10m 10s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	10m 10s
check-bridgejs-generated	2m 49s
build-examples	19m 55s
deploy-examples	0s
	1h 15m 47s

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