refactor(worker): Run one fsck/drop on all branches

[nellh]

fsck and drop both accept multiple branch arguments and will avoid rechecking keys present in multiple branches (while still avoiding any keys not expected in the export). This saves a lot of fsck time on datasets with many versions.

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.01%. Comparing base (6534d8c) to head (66105e9).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
services/datalad/datalad_service/tasks/publish.py	75.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3658   +/-   ##
=======================================
  Coverage   43.01%   43.01%           
=======================================
  Files         636      636           
  Lines       33898    33901    +3     
  Branches     1515     1515           
=======================================
+ Hits        14581    14584    +3     
  Misses      19178    19178           
  Partials      139      139           

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