fsapp: add clean() method

[pmrowla]

related: iterative/dvc#8676, iterative/dvc#8787

[codecov-commenter]

Codecov Report

Base: 78.08% // Head: 79.36% // Increases project coverage by +1.28% 🎉

Coverage data is based on head (0dd33f8) compared to base (b322a64).
Patch coverage: 96.77% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   78.08%   79.36%   +1.28%     
==========================================
  Files          21       21              
  Lines         931      984      +53     
  Branches      147      153       +6     
==========================================
+ Hits          727      781      +54     
- Misses        176      177       +1     
+ Partials       28       26       -2     

Impacted Files	Coverage Δ
src/dvc_task/app/filesystem.py	89.71% <95.00%> (+2.87%)	⬆️
tests/app/test_filesystem.py	100.00% <100.00%> (ø)
src/dvc_task/contrib/kombu_filesystem.py	39.28% <0.00%> (ø)
src/dvc_task/worker/temporary.py	83.60% <0.00%> (+3.27%)	⬆️

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