feat(pull): check all files were downloaded

[tjzegmott]

Non-zero exit code in case of an error. This should show as a failed step in Workflow.

[coveralls]

coverage: 66.489% (+0.5%) from 66.0%
when pulling 2c5a4c9 on pull-ensure-all-files-downloaded
into 8b35e4f on main.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.48%. Comparing base (8b35e4f) to head (2c5a4c9).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
dtcli/pull.py	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   66.00%   66.48%   +0.48%     
==========================================
  Files          14       14              
  Lines        1300     1313      +13     
==========================================
+ Hits          858      873      +15     
+ Misses        442      440       -2     

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