Allows primary files to be of any format supported by fileformats

[tclose]

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[codecov]

Codecov Report

Attention: Patch coverage is 84.00000% with 32 lines in your changes missing coverage. Please review.

Project coverage is 78.05%. Comparing base (2a42035) to head (f1bea51).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
xnat_ingest/session.py	81.35%	22 Missing ⚠️
xnat_ingest/dicom.py	28.57%	5 Missing ⚠️
xnat_ingest/cli/stage.py	87.50%	2 Missing ⚠️
xnat_ingest/tests/test_dicom.py	71.42%	2 Missing ⚠️
xnat_ingest/cli/upload.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
- Coverage   79.01%   78.05%   -0.97%     
==========================================
  Files          13       13              
  Lines        1115     1171      +56     
==========================================
+ Hits          881      914      +33     
- Misses        234      257      +23     

Flag	Coverage Δ
	78.05% <84.00%> (?)

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