BridgeJS: Support `@JS` Swift struct types in imported JS signatures #1995

Job	Run time
Build for native target (macos-15, Xcode_16.4)	3m 16s
format	31s
check-bridgejs-generated	1m 1s
build-examples	45m 16s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 35s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 21s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 9s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 45s
deploy-examples	-1s
check-bridgejs-generated	2m 50s
format	31s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 45s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 21s
deploy-examples	-2509s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 9s
build-examples	45m 16s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 35s
Build for native target (macos-15, Xcode_16.4)	3m 16s
	2h 55m 47s

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