Fix: Remove files produced by barcode splitting when completed

[stumpylog]

Proposed change

After incoming files have been split via one of the barcode options, the produced files are saved to somewhere in the consumption directory. But they weren't removed from the temporary directory used to save them. So clean those up, and the directory as well.

May partly address #2639

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please explain)

Checklist:

• I have read & agree with the contributing guidelines.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.
• If applicable, I have checked that all tests pass, see documentation.
• I have run all pre-commit hooks, see documentation.
• I have made corresponding changes to the documentation as needed.
• I have checked my modifications for any breaking changes.

[codecov]

Codecov Report

Merging #2648 (95fc13c) into dev (7bfb11a) will increase coverage by 0.05%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##              dev    #2648      +/-   ##
==========================================
+ Coverage   93.11%   93.16%   +0.05%     
==========================================
  Files         140      140              
  Lines        5997     6057      +60     
==========================================
+ Hits         5584     5643      +59     
- Misses        413      414       +1     

Flag	Coverage Δ
backend	93.16% <83.33%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
src/documents/tasks.py	92.25% <71.42%> (+0.10%)	⬆️
src/documents/barcodes.py	100.00% <100.00%> (ø)
src/documents/consumer.py	96.38% <0.00%> (+0.41%)	⬆️

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[github-actions]

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