Use GenericLabel over MultiLabel

[tsalo]

Closes none.

Changes proposed in this pull request

• Replace MultiLabel with GenericLabel for ApplyTransforms calls.
• Add a new ApplyTransforms interface that inherits from Niworkflows' FixHeaderApplyTransforms, but with GenericLabel allowed.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 30.93%. Comparing base (25bf8c2) to head (c3c8e25).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fmripost_aroma/interfaces/misc.py	66.66%	4 Missing ⚠️
src/fmripost_aroma/workflows/base.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   31.08%   30.93%   -0.15%     
==========================================
  Files          26       26              
  Lines        2329     2324       -5     
  Branches      362      363       +1     
==========================================
- Hits          724      719       -5     
  Misses       1584     1584              
  Partials       21       21              

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