Warp fsLR surfaces to NLin6 for brainsprite

[tsalo]

Closes #1376.

Changes proposed in this pull request

• Warp surfaces to NLin6 space even if they're provided in fsLR space.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.06%. Comparing base (d43d167) to head (0f12ef6).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
xcp_d/utils/sentry.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1419      +/-   ##
==========================================
- Coverage   79.06%   79.06%   -0.01%     
==========================================
  Files          58       58              
  Lines        7347     7345       -2     
  Branches      970      969       -1     
==========================================
- Hits         5809     5807       -2     
  Misses       1256     1256              
  Partials      282      282              

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