feat(server): Allow worker scopes for tokens

[nellh]

This adds a dataset:worker scope to the API. Allows the worker to make automated requests to the API with the scope of updating a single dataset.

This also corrects an issue where special tokens that never contain emails would occasionally throw an error where the request should have succeeded by checking the email state after the special cases.

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.42%. Comparing base (093bcc8) to head (596b6f7).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...enneuro-server/src/libs/authentication/passport.ts	0.00%	8 Missing ⚠️
...ckages/openneuro-server/src/graphql/permissions.ts	25.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3533      +/-   ##
==========================================
- Coverage   48.44%   48.42%   -0.02%     
==========================================
  Files         596      596              
  Lines       42232    42245      +13     
  Branches     1391     1391              
==========================================
  Hits        20459    20459              
- Misses      21604    21617      +13     
  Partials      169      169              

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