Fix issue that multiple products of the same package cannot be added

[kevin-kp]

Short description 📝

Currently, it does not seem to be possible to add two products from a single package using:

public func addSwiftPackage(repositoryURL: String,
                            productName: String,
                            versionRequirement: XCRemoteSwiftPackageReference.VersionRequirement,
                            targetName: String) throws -> XCRemoteSwiftPackageReference

This is because the duplicate check only takes the reference into account. It should also take the productName into account to make sure that a duplicate can exist of the same reference when the productName is different.

Solution 📦

Add the productName check to the if-test. No other solutions were considered.

Implementation 👩‍💻👨‍💻

• [ x] Add duplicate check
• [ x] Fix unit tests

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[fortmarek]

👏