BridgeJS: show unified diff on snapshot mismatch #2190

Job	Run time
Build for native target (macos-15, Xcode_16.4)	2m 31s
format	31s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 59s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	2m 52s
check-bridgejs-generated	2m 51s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 5s
build-examples	26m 12s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 25s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 56s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 10s
deploy-examples	0s
	1h 35m 32s

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