fix: fix project paths respecting nested projects

[alexanderwe]

📝 Description

This PR fixes a small issue in the recursive build up on child projects in a XCWorkpace. When running extractProjectPaths on the XcodeGraphMapper and encountering a .group the groups location was not appended to the projects path. This results into incorrect paths for any child projects in the graph.

🔎 Detailed explanation

An example contents.xcworkspacedata which contains nested groups:

<?xml version="1.0" encoding="UTF-8"?>
<Workspace
   version = "1.0">
   <FileRef
      location = "group:MyProject/MyProject.xcodeproj">
   </FileRef>
   <Group
      location = "group:Modules"
      name = "Modules">
      <FileRef
         location = "group:ModuleA/ModuleA.xcodeproj">
      </FileRef>
   </Group>
</Workspace>

With the current implementation, the ModuleA project path ends up to be <root>/ModuleA even though it is part of a Modules directory.

With the fix the path of the ModuleA project is correctly at <root>/Modules/ModuleA

[fortmarek]

I'm aligned with the fix, thanks @alexanderwe! Could you also write a small unit test for this? 🙏

[alexanderwe]

I'm aligned with the fix, thanks @alexanderwe! Could you also write a small unit test for this? 🙏

Hey @fortmarek, good point, sorry that I forgot. I have added a small unit test with a workspace and two groups below it. Just let me know if this what you thought of or if I should enhance or slim it down.

[fortmarek]

Thanks @alexanderwe!