Calculate basic CBF in whole FOV

[tsalo]

Related to brain masking issues. Our hope is that this will make ASLPrep derivatives still usable in cases where the brain mask is bad.

Changes proposed in this pull request

• Extract delta-M and calculate basic CBF on all voxels in the acquisition matrix. SCORE/SCRUB and BASIL still use the ASL brain mask.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.77%. Comparing base (b51c487) to head (a14bfd3).

Files with missing lines	Patch %	Lines
aslprep/interfaces/cbf.py	69.23%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #600      +/-   ##
==========================================
- Coverage   75.09%   74.77%   -0.33%     
==========================================
  Files          38       38              
  Lines        4578     4570       -8     
==========================================
- Hits         3438     3417      -21     
- Misses       1140     1153      +13     

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