NFC: BridgeJS: Delegate nested container codegen to generic runtime conformances #2248

Job	Run time
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 6s
build-examples	23m 47s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 31s
format	34s
check-bridgejs-generated	2m 54s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 4s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 48s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 55s
Build for native target (macos-15, Xcode_16.4)	3m 22s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 7s
deploy-examples	-1s
	1h 34m 7s

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