Remove size comparison check when uploading Zarr entries

[jwodder]

In order to cut down on (likely superfluous) API requests.

As discussed in Jitsi today.

[yarikoptic]

Looks LGTM -- let's wait for tests to pass

[codecov]

Codecov Report

Merging #986 (bd2325f) into master (30446b8) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #986      +/-   ##
==========================================
+ Coverage   87.45%   87.50%   +0.04%     
==========================================
  Files          64       64              
  Lines        8109     8106       -3     
==========================================
+ Hits         7092     7093       +1     
+ Misses       1017     1013       -4     

Flag	Coverage Δ
unittests	87.50% <100.00%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
dandi/files.py	78.54% <100.00%> (-0.12%)	⬇️
dandi/dandiapi.py	88.14% <0.00%> (-0.14%)	⬇️
dandi/_version.py	45.96% <0.00%> (+1.75%)	⬆️

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[github-actions]

🚀 PR was released in 0.39.4 🚀