BridgeJS: support imports of JS `Promise` as `async` Swift #2531

Job	Run time
Build for native target (macos-15, Xcode_16.4)	3m 4s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 16s
format	39s
build-examples	4m 20s
prettier	7s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 28s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	4m 20s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	4m 20s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	4m 21s
check-bridgejs-generated	2m 45s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	4m 20s
deploy-examples	1s
	35m 1s

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