[NFC] BridgeJS: Avoid emitting empty skeletons #2114

Job	Run time
Build for native target (macos-15, Xcode_16.4)	2m 10s
build-examples	11m 27s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	11m 26s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 56s
format	32s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	11m 27s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	11m 27s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 53s
check-bridgejs-generated	2m 42s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	11m 32s
deploy-examples	1s
	1h 8m 33s

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