BridgeJS: Correctly emit @JS methods in extensions #2465

Job	Run time
check-bridgejs-generated	2m 36s
Build for native target (macos-15, Xcode_16.4)	2m 11s
format	30s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 55s
build-examples	19m 26s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	3m 5s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	3m 4s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 56s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	2m 50s
prettier	11s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	3m 5s
deploy-examples	-1s
	42m 48s

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