Use SwiftSyntax prebuilt action in CI #2712

Job	Run time
Build for native target (macos-15, Xcode_26.0.1)	3m 24s
check-bridgejs-generated	3m 36s
format	36s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 38s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	20m 48s
prettier	12s
build-examples	57m 45s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	14m 33s
Test BridgeJS against Swift versions (swift:6.3, 603.0.2)	9m 8s
deploy-examples	0s
	2h 3m 40s

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