Check multipart upload checksum manually

[MrCreosote]

Not clear why CEPH isn't throwing an error when the provided checksum is wrong; for now we work around it by checking ourselves

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 53.33%. Comparing base (9441195) to head (0586cdb).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
cdmtaskservice/s3/client.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #577   +/-   ##
=======================================
  Coverage   53.33%   53.33%           
=======================================
  Files          69       69           
  Lines        5972     5975    +3     
=======================================
+ Hits         3185     3187    +2     
- Misses       2787     2788    +1     

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