feat: Require events.tsv for non-rest tasks

[effigies]

Promotes EVENTS_TSV_MISSING to an error.

This may end up with some false positives. We should be able to do some additional filtering based on path, but if the logic gets complicated then this would be a good use case for patching the schema.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 47.03%. Comparing base (25a7401) to head (51c64e5).

Files with missing lines	Patch %	Lines
...openneuro-app/src/scripts/workers/schema.worker.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3318      +/-   ##
==========================================
- Coverage   47.03%   47.03%   -0.01%     
==========================================
  Files         583      583              
  Lines       36954    36955       +1     
  Branches     1174     1174              
==========================================
  Hits        17382    17382              
- Misses      19385    19386       +1     
  Partials      187      187              

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