Use SwiftSyntax prebuilt action in CI #2719

Job	Run time
prettier	11s
Test BridgeJS against Swift versions (swift:6.3, 603.0.2)	3m 14s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	8m 52s
format	38s
check-bridgejs-generated	3m 35s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	8m 51s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	8m 53s
build-examples	8m 50s
Build for native target (macos-15, Xcode_26.0.1)	3m 40s
deploy-examples	1s
	46m 45s

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