Treat anatomical data differently in data collection

[tsalo]

Closes #62.

Changes proposed in this pull request

• For anatomical data, only retain the session entity (optionally) from the bold file during collection.

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 30.64%. Comparing base (fbf0540) to head (3239457).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fmripost_aroma/utils/bids.py	54.54%	3 Missing and 2 partials ⚠️
src/fmripost_aroma/workflows/base.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   30.58%   30.64%   +0.06%     
==========================================
  Files          26       26              
  Lines        2351     2359       +8     
  Branches      370      374       +4     
==========================================
+ Hits          719      723       +4     
- Misses       1611     1613       +2     
- Partials       21       23       +2     

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