test(toml): inline test data

[timreichen]

This PR inlines test data. This makes the tests easier to understand and also prevents dead files (like toml/testdata/cargoTest.toml).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.68%. Comparing base (d6823ad) to head (7039273).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6473      +/-   ##
==========================================
- Coverage   95.72%   95.68%   -0.04%     
==========================================
  Files         575      575              
  Lines       43192    43192              
  Branches     6471     6475       +4     
==========================================
- Hits        41344    41330      -14     
- Misses       1815     1823       +8     
- Partials       33       39       +6     

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[iuioiua]

Niiice

[kt3k]

LGTM