BridgeJS: Unify `JSUndefinedOr` and `Optional` intrinsic methods #2419

Job	Run time
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 6s
check-bridgejs-generated	2m 44s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 59s
prettier	7s
format	31s
Build for native target (macos-15, Xcode_16.4)	2m 16s
build-examples	18m 18s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	11m 51s
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/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 58s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 38s
deploy-examples	0s
	1h 27m 32s

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