[NFC] BridgeJS: Avoid emitting empty skeletons (#574) #2119

Job	Run time
build-examples	17m 55s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 45s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 29s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 19s
check-bridgejs-generated	2m 36s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 52s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 27s
format	30s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 57s
Build for native target (macos-15, Xcode_16.4)	3m 27s
deploy-examples	8s
	1h 26m 25s

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