fix: problem getting project references for new and old style projects

[wgnf]

📄 Description

This PR fixes an issue when getting the project-references for an SDK-Style project, which references a non-SDK-Style project

this also improves performance a lot

✅ Checks

• [x] My PR adheres to the general code-style of this project (look at other code if you're unsure)
• [ ] My code requires changes to the documentation
• [ ] I have updated the documentation as required
• [x] All the automated tests have passed

[codecov[bot]]

Codecov Report

Merging #111 (b8a1bc3) into main (b4df6ea) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #111      +/-   ##
==========================================
+ Coverage   96.83%   96.86%   +0.03%     
==========================================
  Files          54       53       -1     
  Lines        2177     2204      +27     
==========================================
+ Hits         2108     2135      +27     
  Misses         69       69              

Impacted Files	Coverage Δ
...nces/DotnetCli/GetPackageReferencesViaDotnetCli.cs	100.00% <100.00%> (ø)
src/Core/Liz.Core/Projects/GetProjectReferences.cs	100.00% <100.00%> (ø)
...Core/Liz.Core/Projects/Contracts/Models/Project.cs

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