chore(coverage): replace test_coverage

[wasabeef]

What does this change?

• Replace test_coverage, avoid test_coverage in deps

What is the value of this and can you measure success?

• Pass CI

[codecov]

Codecov Report

Merging #84 (3b6685d) into main (992fd75) will decrease coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   98.22%   98.01%   -0.21%     
==========================================
  Files          16       16              
  Lines         506      505       -1     
==========================================
- Hits          497      495       -2     
- Misses          9       10       +1     

Impacted Files	Coverage Δ
packages/core/lib/utils/file.dart	75.00% <0.00%> (-25.00%)	⬇️
packages/core/lib/generators/assets_generator.dart	100.00% <0.00%> (ø)

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