Revert PR #409 (Content-MD5 header)

[jwodder]

See this comment and dchiquito's response

[codecov]

Codecov Report

Merging #419 (8227e71) into master (a6d290a) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
- Coverage   82.31%   82.28%   -0.03%     
==========================================
  Files          55       55              
  Lines        5693     5674      -19     
==========================================
- Hits         4686     4669      -17     
+ Misses       1007     1005       -2     

Flag	Coverage Δ
unittests	82.28% <100.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
dandi/tests/test_dandiapi.py	100.00% <ø> (ø)
dandi/dandiapi.py	88.31% <100.00%> (-0.58%)	⬇️
dandi/upload.py	75.93% <0.00%> (+0.75%)	⬆️

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[yarikoptic]

eh, ok -- so it seems we cannot do this additional upload integrity/validation checking without informing the api-server about those per each chunk since it is the one which is to mint those urls.