BridgeJS: support imports of JS `Promise` as `async` Swift #2514

Job	Run time
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 4s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 25s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 57s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 45s
build-examples	6m 42s
Build for native target (macos-15, Xcode_16.4)	3m 15s
prettier	11s
format	36s
check-bridgejs-generated	2m 41s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 8s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 9s
deploy-examples	0s
	1h 16m 53s

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