ENH: Save msm registration sphere as desc-msm_sphere.surf.gii

[effigies]

Follow-up to #358 in smriprep-next. This continues to save the initial space-fsLR_desc-reg_sphere.surf.gii and adds space-fsLR_desc-msm_sphere.surf.gii.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +27.63% 🎉

Comparison is base (b065045) 31.49% compared to head (db014df) 59.13%.

Additional details and impacted files

@@             Coverage Diff             @@
##             next     #365       +/-   ##
===========================================
+ Coverage   31.49%   59.13%   +27.63%     
===========================================
  Files          21       26        +5     
  Lines        1762     1845       +83     
  Branches      233      235        +2     
===========================================
+ Hits          555     1091      +536     
+ Misses       1194      698      -496     
- Partials       13       56       +43     

Flag	Coverage Δ
ds005	∅ <ø> (?)
ds054	46.82% <0.00%> (?)
pytest	37.18% <0.00%> (?)

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

Files Changed	Coverage Δ
smriprep/workflows/anatomical.py	44.73% <0.00%> (+32.61%)	⬆️
smriprep/workflows/outputs.py	53.98% <0.00%> (+38.28%)	⬆️

... and 16 files with indirect coverage changes

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