[integration-tests] rename nextest-tests to fixture-project

[sunshowers]

The old name was always a bit awkward.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.35%. Comparing base (54cb257) to head (b9053e0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
integration-tests/src/seed.rs	66.66%	1 Missing ⚠️
...tegration-tests/test-helpers/build-seed-archive.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3198      +/-   ##
==========================================
+ Coverage   85.32%   85.35%   +0.03%     
==========================================
  Files         158      159       +1     
  Lines       46888    47018     +130     
==========================================
+ Hits        40005    40132     +127     
- Misses       6883     6886       +3     

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[trunk-io]

     

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