Progressive loading for schema validator output

[nellh]

This avoids loading the BIDS validator output for schema validator datasets, instead loading this once the validation drop down is clicked. For many datasets this avoids several megabytes of data transfer and potentially expensive API requests until this is actually needed.

A related bug fix is included to more accurately disable creating snapshots when the schema validator output contains errors or the draft has no author values provided.

See #3313

[codecov]

Codecov Report

Attention: Patch coverage is 54.40415% with 88 lines in your changes missing coverage. Please review.

Project coverage is 47.21%. Comparing base (769d876) to head (3729f05).

Files with missing lines	Patch %	Lines
...src/scripts/validation/validation-results-query.ts	56.81%	19 Missing ⚠️
...enneuro-server/src/graphql/resolvers/validation.ts	0.00%	19 Missing ⚠️
...-app/src/scripts/validation/validation-results.tsx	48.38%	16 Missing ⚠️
...nneuro-app/src/scripts/dataset/routes/snapshot.tsx	0.00%	13 Missing ⚠️
...penneuro-app/src/scripts/validation/validation.tsx	79.31%	12 Missing ⚠️
packages/openneuro-server/src/graphql/schema.ts	0.00%	5 Missing ⚠️
...enneuro-app/src/scripts/uploader/upload-issues.tsx	0.00%	2 Missing ⚠️
...nneuro-app/src/scripts/dataset/draft-container.tsx	0.00%	1 Missing ⚠️
...pp/src/scripts/dataset/routes/tab-routes-draft.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3322      +/-   ##
==========================================
- Coverage   47.72%   47.21%   -0.51%     
==========================================
  Files         590      591       +1     
  Lines       37666    37751      +85     
  Branches     1272     1243      -29     
==========================================
- Hits        17976    17826     -150     
- Misses      19503    19738     +235     
  Partials      187      187              

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