Fix regression in ModuleMapMapper due to outdated Graph properties

[fortmarek]

Short description 📝

The latest release contains a regression due to: #6218

The regression happened because:

• ModuleMapMapper is no longer called that early in the process before other mappers update the graph
• We made some bad design decisions in the past and targets and dependencies are available in two ways. In mappers, we don't always update both properties (in this case Graph.dependencies and Target.dependencies) which makes the other one outdated. That's exactly what happened here.

The solution for now is to access target dependencies through GraphTraverser but long-term, we should get rid of these duplicated properties altogether, so bugs like this are no longer possible.

How to test the changes locally 🧐

Run tuist generate when using binaries.

Contributor checklist ✅

• The code has been linted using run mise run lint:fix
• The change is tested via unit testing or acceptance testing, or both
• The title of the PR is formulated in a way that is usable as a changelog entry
• In case the PR introduces changes that affect users, the documentation has been updated

Reviewer checklist ✅

• The code architecture and patterns are consistent with the rest of the codebase
• Reviewer has checked that, if needed, the PR includes the label changelog:added, changelog:fixed, or changelog:changed, and the title is usable as a changelog entry