BridgeJS: Remove `@JS protocol` in favor of `@JSClass struct` #2053

Job	Run time
Build for native target (macos-15, Xcode_16.4)	3m 20s
format	29s
build-examples	18m 12s
check-bridgejs-generated	2m 44s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 59s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 19s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 47s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 6s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 13s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 14s
deploy-examples	-1s
	1h 28m 22s

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