[NFC] BridgeJS: Avoid emitting empty skeletons #2113

Job	Run time
format	33s
check-bridgejs-generated	2m 41s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 49s
build-examples	8m 18s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	8m 19s
Build for native target (macos-15, Xcode_16.4)	3m 56s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	8m 20s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 53s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	8m 19s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	8m 19s
deploy-examples	1s
	54m 28s

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