refactor(app): Replace Elastic APM with Sentry

[nellh]

Tried out a few options but Sentry is compatible with Deno and avoids the need to manage APM along with search.

[codecov]

Codecov Report

Attention: Patch coverage is 4.08163% with 47 lines in your changes missing coverage. Please review.

Project coverage is 42.60%. Comparing base (398051a) to head (4575c31).
Report is 2 commits behind head on master.

Files	Patch %	Lines
packages/openneuro-app/src/scripts/sentry.ts	0.00%	19 Missing and 1 partial ⚠️
packages/openneuro-app/src/scripts/config.ts	0.00%	8 Missing ⚠️
...pp/src/scripts/dataset/download/download-native.js	12.50%	7 Missing ⚠️
...es/openneuro-app/src/scripts/uploader/uploader.jsx	0.00%	3 Missing and 1 partial ⚠️
...ro-app/src/scripts/pages/front-page/front-page.tsx	0.00%	3 Missing ⚠️
...penneuro-app/src/scripts/dataset/dataset-query.jsx	0.00%	2 Missing ⚠️
packages/openneuro-app/src/client.jsx	0.00%	1 Missing ⚠️
...openneuro-app/src/scripts/errors/errorBoundary.jsx	50.00%	1 Missing ⚠️
packages/openneuro-server/src/handlers/config.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3119      +/-   ##
==========================================
- Coverage   42.66%   42.60%   -0.06%     
==========================================
  Files         593      592       -1     
  Lines       37855    37811      -44     
  Branches     1098     1094       -4     
==========================================
- Hits        16149    16111      -38     
+ Misses      21499    21492       -7     
- Partials      207      208       +1     

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