forces Raw move to CPU

[Intron7]

Hey,
so I found that the implementation I used to force Raw to the CPU was not covering all cases. I added a second check. I should now always move .X to the CPU.

[ivirshup]

Thanks!

Is there a test case that needs updating to include whatever was failing before?

[codecov]

Codecov Report

Merging #1107 (870e326) into main (70c5d73) will decrease coverage by 32.31%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1107       +/-   ##
===========================================
- Coverage   84.76%   52.46%   -32.31%     
===========================================
  Files          36       36               
  Lines        5128     5133        +5     
===========================================
- Hits         4347     2693     -1654     
- Misses        781     2440     +1659     

Flag	Coverage Δ
gpu-tests	52.46% <100.00%> (+0.08%)	⬆️

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

Files Changed	Coverage Δ
anndata/_core/raw.py	67.62% <100.00%> (-11.94%)	⬇️

... and 23 files with indirect coverage changes

[Intron7]

@ivirshup I added two tests. I hope I put them into the right place.

[ivirshup]

Yep, I made some minor changes

• I think it's a little confusing to have names from both cupyx.scipy.sparse and scipy.sparse imported, so I've qualified their usage
• I think isspmatrix_csr will be deprecated, so I've replaced it with an instance check