filter empty directory files and compute hash w/o file metadata

[artsiomtserashkovich]

Before submitting checklist

• Did you update the CHANGELOG? (not for test updates, internal changes/refactors or CI/CD setup)
• Did you ask the docs owner to review all the user-facing changes?

[codecov]

Codecov Report

Patch coverage: 97.14% and project coverage change: +0.02% 🎉

Comparison is base (1977426) 79.45% compared to head (c793914) 79.48%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1421      +/-   ##
==========================================
+ Coverage   79.45%   79.48%   +0.02%     
==========================================
  Files         280      280              
  Lines       13875    13909      +34     
==========================================
+ Hits        11025    11056      +31     
- Misses       2850     2853       +3     

Flag	Coverage Δ
e2e	71.36% <45.71%> (-0.02%)	⬇️
e2e-management	55.73% <37.14%> (-0.05%)	⬇️
e2e-s3	55.56% <45.71%> (-0.03%)	⬇️
e2e-s3-gcs	55.56% <45.71%> (-0.03%)	⬇️
e2e-standard	71.16% <45.71%> (-0.02%)	⬇️
macos	79.28% <97.14%> (+0.05%)	⬆️
py3.10	71.25% <45.71%> (-8.11%)	⬇️
py3.7	78.96% <97.14%> (+0.02%)	⬆️
py3.7.16	70.51% <45.71%> (-8.21%)	⬇️
py3.8	?
py3.9	?
ubuntu	79.23% <97.14%> (+<0.01%)	⬆️
unit	73.15% <91.42%> (-0.59%)	⬇️
windows	79.23% <97.14%> (-0.02%)	⬇️

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Files Changed	Coverage Δ
...ne/internal/backends/hosted_artifact_operations.py	89.61% <90.90%> (+0.05%)	⬆️
src/neptune/internal/artifacts/file_hasher.py	100.00% <100.00%> (ø)
src/neptune/internal/backends/api_model.py	97.04% <100.00%> (+0.10%)	⬆️
...eptune/internal/backends/hosted_neptune_backend.py	77.62% <100.00%> (+0.10%)	⬆️

... and 7 files with indirect coverage changes

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