fix(worker): Partsize should not be set for GCP object remotes

[nellh]

For objects larger than 1GiB this would fail to push to the backup bucket. partsize=none seems to solve this for any size object.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.01%. Comparing base (556e037) to head (ed63f89).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3652   +/-   ##
=======================================
  Coverage   43.01%   43.01%           
=======================================
  Files         636      636           
  Lines       33887    33887           
  Branches     1515     1513    -2     
=======================================
  Hits        14578    14578           
  Misses      19170    19170           
  Partials      139      139           

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