BridgeJS: Update `JSUndefinedOr` APIs #2235

Job	Run time
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 0s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 28s
Build for native target (macos-15, Xcode_16.4)	2m 16s
build-examples	26m 27s
check-bridgejs-generated	2m 45s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 4s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 8s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 0s
format	32s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 16s
deploy-examples	-1s
	1h 34m 55s

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