Simplify parallel dependency diagnostics generation

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.64%. Comparing base (d8f0526) to head (9c09c7a).

Files with missing lines	Patch %	Lines
src/rule/parallel_dependencies.rs	94.73%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #176   +/-   ##
=======================================
  Coverage   90.63%   90.64%           
=======================================
  Files          54       54           
  Lines        9012     9008    -4     
=======================================
- Hits         8168     8165    -3     
+ Misses        844      843    -1     

Flag	Coverage Δ
unit	90.64% <94.73%> (+<0.01%)	⬆️

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