Revert "BridgeJS: Correctly emit @JS methods in extensions" #2487

Job	Run time
format	37s
Build for native target (macos-15, Xcode_16.4)	3m 11s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 13s
build-examples	19m 50s
prettier	7s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 9s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 6s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 17s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 58s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 54s
check-bridgejs-generated	2m 34s
deploy-examples	0s
	1h 29m 56s

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