NFC: BridgeJS: Further simplify codegen and JSValue intrinsics #3

Job	Run time
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 6s
check-bridgejs-generated	2m 48s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 8s
format	33s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 51s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 12s
Build for native target (macos-15, Xcode_16.4)	2m 9s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 40s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 38s
build-examples	26m 17s
deploy-examples	4s
	1h 34m 26s

Provide feedback