Fix contract/dependencies conflict checker

[chasefleming]

Closes #1599

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For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 39.61%. Comparing base (9d33723) to head (85cc0c2).

Files	Patch %	Lines
internal/dependencymanager/dependencyinstaller.go	23.07%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1600      +/-   ##
==========================================
- Coverage   39.95%   39.61%   -0.35%     
==========================================
  Files          51       51              
  Lines        3346     3345       -1     
==========================================
- Hits         1337     1325      -12     
- Misses       1841     1851      +10     
- Partials      168      169       +1     

Flag	Coverage Δ
unittests	39.61% <23.07%> (-0.35%)	⬇️

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