feat: Demote PARTICIPANT_ID_MISMATCH to a warning for now

[effigies]

Addressing problems with https://openneuro.org/datasets/ds005752/ that can't be reasonably resolved within the dataset. This is quite a minor issue, and we can hopefully get rid of this exception soon.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 48.25%. Comparing base (1c61144) to head (5fcc2dc).

Files with missing lines	Patch %	Lines
...openneuro-app/src/scripts/workers/schema.worker.ts	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3320      +/-   ##
==========================================
+ Coverage   47.42%   48.25%   +0.83%     
==========================================
  Files         587      587              
  Lines       37285    37291       +6     
  Branches     1243     1277      +34     
==========================================
+ Hits        17683    17996     +313     
+ Misses      19415    19117     -298     
+ Partials      187      178       -9     

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