feat: make use_rep accept anndata.acc

[flying-sheep]

• Closes Have use_rep accept anndata.acc acessors #4314
• Tests included or not required because:

• Release notes not necessary because:

[codecov]

Codecov Report

❌ Patch coverage is 88.37209% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.14%. Comparing base (e6269f5) to head (abb365f).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/scanpy/tools/_ingest.py	61.53%	5 Missing ⚠️
src/scanpy/tools/_utils.py	88.46%	3 Missing ⚠️
src/scanpy/get/get.py	94.11%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4315      +/-   ##
==========================================
+ Coverage   80.08%   80.14%   +0.06%     
==========================================
  Files         133      133              
  Lines       13424    13478      +54     
==========================================
+ Hits        10750    10802      +52     
- Misses       2674     2676       +2     

Flag	Coverage Δ
hatch-test.low-vers	77.92% <63.95%> (-0.09%)	⬇️
hatch-test.pre	80.01% <88.37%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/scanpy/neighbors/__init__.py	81.54% <100.00%> (+0.05%)	⬆️
src/scanpy/neighbors/_doc.py	100.00% <100.00%> (ø)
src/scanpy/neighbors/_types.py	100.00% <100.00%> (ø)
src/scanpy/tools/_dendrogram.py	82.97% <100.00%> (+0.37%)	⬆️
src/scanpy/tools/_tsne.py	75.55% <100.00%> (+0.55%)	⬆️
src/scanpy/tools/_umap.py	86.53% <100.00%> (+0.26%)	⬆️
src/scanpy/get/get.py	89.88% <94.11%> (+0.42%)	⬆️
src/scanpy/tools/_utils.py	90.24% <88.46%> (+3.28%)	⬆️
src/scanpy/tools/_ingest.py	80.93% <61.53%> (-0.10%)	⬇️