Fix Package.swift warning by excluding JavaScript files #1626

Job	Run time
Build for native target (macos-15, Xcode_16.4)	50s
build-examples	11m 31s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	4m 49s
format	33s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	7m 21s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6m 56s
check-bridgejs-generated	6m 16s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	5m 23s
deploy-examples	0s
	43m 39s

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