feat(worker): Allow indexing URLs from a whitelist of S3 buckets

[nellh]

This is the simplest version of allowing S3 buckets not configured by OpenNeuro to display URLs to the front end.

For future work, we will need to index and test remotes, then warn the uploader and disable versioning/publishing until an accessible copy of all objects is present to allow minting a DOI.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.06%. Comparing base (4e58a68) to head (23b89a1).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3138      +/-   ##
==========================================
- Coverage   44.07%   44.06%   -0.01%     
==========================================
  Files         593      593              
  Lines       37749    37750       +1     
  Branches     1124     1124              
==========================================
  Hits        16636    16636              
- Misses      20911    20912       +1     
  Partials      202      202              

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