chore: migrate settings to scverse_misc

[ilan-gold]

• Closes #
• Tests added

• Release note not necessary because:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.59%. Comparing base (a7ba562) to head (3e84820).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2446      +/-   ##
==========================================
- Coverage   85.69%   85.59%   -0.10%     
==========================================
  Files          49       49              
  Lines        7793     7656     -137     
==========================================
- Hits         6678     6553     -125     
+ Misses       1115     1103      -12     

Files with missing lines	Coverage Δ
src/anndata/_settings.py	100.00% <100.00%> (+7.40%)	⬆️