Adjust `getAllCarthageDependencies` to return unique dependencies
Adjust `getAllCarthageDependencies` to return unique dependencies

Copies the pattern from `getAllDependenciesPlusTransitiveNeedingEmbedding`. They should be combined into one solution eventually.

yonaskolb/XcodeGen,yonaskolb/XcodeGen,yonaskolb/XcodeGen,yonaskolb/XcodeGen