BridgeJS: support imports of JS `Promise` as `async` Swift #2524

Job	Run time
Build for native target (macos-15, Xcode_16.4)	1m 13s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	1m 1s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1m 12s
format	47s
check-bridgejs-generated	1m 57s
build-examples	1m 0s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	1m 13s
prettier	13s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	1m 1s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	1m 12s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	1m 0s
deploy-examples	1s
	11m 50s

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