Move from mypy to ty

[hmgaudecker]

• use ty instead of mypy. Run with:

  pixi run ty check

• pre-commits are disabled, I played around a bit with local suggestions as described here, but probably we should just wait for a (semi-)official one to appear.

• Sort-of unrelated changes (they were actually caught when I had not disabled ty for that notebook): Fix the example in the docs and some test names, which still referred to an old function name

[review-notebook-app]

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[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.24%. Comparing base (96d0e54) to head (94e5848).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dags/dag.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   95.34%   95.24%   -0.10%     
==========================================
  Files          22       22              
  Lines        1073     1073              
==========================================
- Hits         1023     1022       -1     
- Misses         50       51       +1     

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[timmens]

Very exciting times, very nice!