PackageToPlugin: Fix build when the repo is cloned as a different name #1708

Job	Run time
Build for native target (macos-15, Xcode_16.4)	1m 16s
format	32s
check-bridgejs-generated	6m 12s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	4m 43s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	4m 16s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6m 41s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6m 3s
build-examples	11m 50s
deploy-examples	8s
	41m 41s

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