BridgeJS: Fix namespace enum with `@JS(namespace:)` attribute #2060

Job	Run time
check-bridgejs-generated	3m 2s
build-examples	18m 7s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 4s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 6s
format	32s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 57s
Build for native target (macos-15, Xcode_16.4)	3m 4s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 43s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 59s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 57s
deploy-examples	0s
	1h 28m 31s

Provide feedback