fix: disallow transpose for "raw" backed array objects

[ilan-gold]

• See Simplify backed internal checking #2369 point 4.
• Tests added

• Release note not necessary because:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.48%. Comparing base (aae79ef) to head (c0106be).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2399      +/-   ##
==========================================
- Coverage   87.06%   85.48%   -1.59%     
==========================================
  Files          49       49              
  Lines        7725     7728       +3     
==========================================
- Hits         6726     6606     -120     
- Misses        999     1122     +123     

Files with missing lines	Coverage Δ
src/anndata/_core/anndata.py	86.33% <100.00%> (+0.05%)	⬆️

... and 13 files with indirect coverage changes