refactor(app): Decouple React client from @openneuro/client

[nellh]

The client package will no longer be needed with the move to deno CLI and this allows for frontend specific client configuration.

Fixes error handling not bubbling up properly across the React app. Otherwise no functional changes.

[codecov]

Codecov Report

Attention: Patch coverage is 14.85507% with 235 lines in your changes missing coverage. Please review.

Project coverage is 44.26%. Comparing base (0d7bdd7) to head (9cd288d).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
...o-app/src/scripts/uploader/file-upload-parallel.ts	0.00%	121 Missing and 1 partial ⚠️
...enneuro-app/src/scripts/uploader/hash-file-list.ts	0.00%	35 Missing and 1 partial ⚠️
...nneuro-app/src/scripts/uploader/upload-mutation.js	0.00%	31 Missing and 1 partial ⚠️
...es/openneuro-app/src/scripts/uploader/uploader.jsx	0.00%	24 Missing ⚠️
packages/openneuro-app/src/client.jsx	0.00%	15 Missing ⚠️
.../openneuro-app/src/scripts/uploader/file-upload.js	0.00%	3 Missing ⚠️
...app/src/scripts/dataset/download/download-query.js	94.44%	2 Missing ⚠️
...ackages/openneuro-app/src/scripts/utils/datalad.js	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3194      +/-   ##
==========================================
- Coverage   44.45%   44.26%   -0.19%     
==========================================
  Files         592      594       +2     
  Lines       37861    38104     +243     
  Branches     1131     1133       +2     
==========================================
+ Hits        16830    16868      +38     
- Misses      20831    21034     +203     
- Partials      200      202       +2     

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