fix(worker): Prefer the s3-PUBLIC remote when found

[nellh]

Fixes an issue where the wrong remote was sometimes selected to return a file URL.

See #3145

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 44.04%. Comparing base (d161827) to head (5622b6f).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
services/datalad/datalad_service/common/annex.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3146      +/-   ##
==========================================
- Coverage   44.04%   44.04%   -0.01%     
==========================================
  Files         593      593              
  Lines       37788    37790       +2     
  Branches     1124     1124              
==========================================
  Hits        16644    16644              
- Misses      20942    20944       +2     
  Partials      202      202              

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