Fix generating duplicated Digraphs

[iurysza]

🚀 Description

Fixes a regression where we would generate repeated graph edges.

• Introduce handling for configuration-specific link texts in DigraphBuilder.
• Add tests simulating a real project with multiple configurations for each project dependency

📄 Motivation and Context

🧪 How Has This Been Tested?

Unit tests, sample app, real project

📦 Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

✅ Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.