Clean up UploadFinisher task a bit

[Swatinem]

Fixes a typo, adds a few types and simplifies code slightly

---

Extracted from #592

[codecov-qa]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.59%. Comparing base (c6d3ce2) to head (22d3dff).

✅ All tests successful. No failed tests found.

Files	Patch %	Lines
tasks/upload_finisher.py	85.71%	2 Missing ⚠️

@@           Coverage Diff           @@
##             main     #607   +/-   ##
=======================================
  Coverage   97.59%   97.59%           
=======================================
  Files         431      431           
  Lines       36073    36069    -4     
=======================================
- Hits        35205    35202    -3     
+ Misses        868      867    -1     

Flag	Coverage Δ
integration	97.59% <85.71%> (+<0.01%)	⬆️
latest-uploader-overall	97.59% <85.71%> (+<0.01%)	⬆️
unit	97.59% <85.71%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
NonTestCode	94.78% <85.71%> (+<0.01%)	⬆️
OutsideTasks	97.82% <ø> (ø)

Files	Coverage Δ
tasks/tests/unit/test_upload_finisher_task.py	100.00% <ø> (ø)
tasks/upload_finisher.py	73.58% <85.71%> (-0.03%)	⬇️

[codecov-notifications]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files	Patch %	Lines
tasks/upload_finisher.py	85.71%	2 Missing ⚠️

@@           Coverage Diff           @@
##             main     #607   +/-   ##
=======================================
  Coverage   97.59%   97.59%           
=======================================
  Files         431      431           
  Lines       36073    36069    -4     
=======================================
- Hits        35205    35202    -3     
+ Misses        868      867    -1     

Flag	Coverage Δ
integration	97.59% <85.71%> (+<0.01%)	⬆️
latest-uploader-overall	97.59% <85.71%> (+<0.01%)	⬆️
unit	97.59% <85.71%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
NonTestCode	94.78% <85.71%> (+<0.01%)	⬆️
OutsideTasks	97.82% <ø> (ø)

Files	Coverage Δ
tasks/tests/unit/test_upload_finisher_task.py	100.00% <ø> (ø)
tasks/upload_finisher.py	73.58% <85.71%> (-0.03%)	⬇️

[codecov-public-qa]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.59%. Comparing base (c6d3ce2) to head (22d3dff).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

@@           Coverage Diff           @@
##             main     #607   +/-   ##
=======================================
  Coverage   97.59%   97.59%           
=======================================
  Files         431      431           
  Lines       36073    36069    -4     
=======================================
- Hits        35205    35202    -3     
+ Misses        868      867    -1     

Flag	Coverage Δ
integration	97.59% <85.71%> (+<0.01%)	⬆️
latest-uploader-overall	97.59% <85.71%> (+<0.01%)	⬆️
unit	97.59% <85.71%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
NonTestCode	94.78% <85.71%> (+<0.01%)	⬆️
OutsideTasks	97.82% <ø> (ø)

Files	Coverage Δ
tasks/tests/unit/test_upload_finisher_task.py	100.00% <ø> (ø)
tasks/upload_finisher.py	73.58% <85.71%> (-0.03%)	⬇️

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.63%. Comparing base (c6d3ce2) to head (22d3dff).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files	Patch %	Lines
tasks/upload_finisher.py	85.71%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #607   +/-   ##
=======================================
  Coverage   97.63%   97.63%           
=======================================
  Files         466      466           
  Lines       37279    37275    -4     
=======================================
- Hits        36397    36394    -3     
+ Misses        882      881    -1     

Flag	Coverage Δ
integration	97.59% <85.71%> (+<0.01%)	⬆️
latest-uploader-overall	97.59% <85.71%> (+<0.01%)	⬆️
unit	97.59% <85.71%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
NonTestCode	94.86% <85.71%> (+<0.01%)	⬆️
OutsideTasks	97.82% <ø> (ø)

Files	Coverage Δ
tasks/tests/unit/test_upload_finisher_task.py	100.00% <ø> (ø)
tasks/upload_finisher.py	73.70% <85.71%> (-0.03%)	⬇️

Related Entrypoints
run/app.tasks.upload.UploadFinisher