Suppress warning about the unused README.md file in BridgeJSTool #1610

Job	Run time
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	5m 56s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6m 46s
build-examples	12m 37s
Build for native target (macos-15, Xcode_16.4)	34s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	4m 58s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	5m 7s
format	52s
deploy-examples	1m 31s
	38m 21s

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