BridgeJS: Support non-ConvertibleToJSValue async exported return type… #2678

Job	Run time
Build for native target (macos-15, Xcode_16.4)	3m 7s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 3s
prettier	14s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 1s
check-bridgejs-generated	3m 5s
build-examples	19m 35s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 38s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 16s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 12s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 11s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 29s
format	34s
deploy-examples	8s
	1h 34m 33s

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