NFC: BridgeJS: Centralize type info on BridgeType, remove dead cleanup infrastructure #2319

Job	Run time
build-examples	14m 26s
format	34s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 0s
Build for native target (macos-15, Xcode_16.4)	3m 25s
check-bridgejs-generated	2m 39s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	14m 25s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 13s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	12m 57s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 46s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 3s
deploy-examples	1s
	1h 21m 29s

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