NFC: BridgeJS: Further simplify codegen and JSValue intrinsics #2266

Job	Run time
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 55s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 1s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 1s
format	30s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 11s
build-examples	24m 52s
check-bridgejs-generated	2m 39s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	11m 46s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 23s
Build for native target (macos-15, Xcode_16.4)	3m 30s
deploy-examples	0s
	1h 34m 48s

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