BridgeJS: Support `@JS` Swift struct types in imported JS signatures #1994

Job	Run time
format	32s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	3m 6s
Build for native target (macos-15, Xcode_16.4)	2m 38s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	3m 6s
build-examples	43m 19s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	2m 51s
check-bridgejs-generated	2m 52s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	3m 5s
deploy-examples	0s
	1h 1m 29s

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