fix(fill): don't split slow tests into separate pre-alloc groups

[danceratopz]

🗒️ Description

This PR removes the automatic application of @pytest.mark.pre_alloc_group if a test case is marked as slow.

This removes > 1000 unnecessary pre-alloc groups, which speeds up consume enginex.

⚠️ @spencer-tb perhaps you should tag a release before this gets merged, just in case this causes release generation to time out - after #1804 this shouldn't be a problem.

🔗 Related Issues or PRs

Spotted while testing the enginex simulator:

• feat(consume): initial implementation of enginex danceratopz/execution-specs#1

✅ Checklist

• All: Ran fast tox checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  uvx tox -e static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered adding an entry to CHANGELOG.md. skipped
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.08%. Comparing base (fa1a2bb) to head (06296b9).
⚠️ Report is 20 commits behind head on forks/osaka.

Additional details and impacted files

@@               Coverage Diff               @@
##           forks/osaka    #1819      +/-   ##
===============================================
- Coverage        86.08%   86.08%   -0.01%     
===============================================
  Files              743      743              
  Lines            44072    44076       +4     
  Branches          3891     3891              
===============================================
+ Hits             37938    37941       +3     
- Misses            5656     5657       +1     
  Partials           478      478              

Flag	Coverage Δ
unittests	86.08% <ø> (-0.01%)	⬇️

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