Refactor/contributor citation events

[thinknoack]

refactors contributor events to be approved during the create event and only send a notification that a user has been added, instead of requiring approval.

users resolver not allows for searching of users by non admin, only admin can see email, admin, and blocked fields

adds a hasEdit check for dataset editing of the contributor list/form

[codecov]

Codecov Report

❌ Patch coverage is 29.11392% with 56 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.09%. Comparing base (c25c7ef) to head (62dd1b1).
⚠️ Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
...euro-server/src/graphql/resolvers/datasetEvents.ts	0.00%	28 Missing ⚠️
...app/src/scripts/contributors/contributors-list.tsx	40.00%	18 Missing ⚠️
...otifications/user-notifications-accordion-body.tsx	0.00%	7 Missing ⚠️
...tifications/user-notification-accordion-header.tsx	0.00%	2 Missing ⚠️
...ges/openneuro-app/src/scripts/types/event-types.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3621      +/-   ##
==========================================
+ Coverage   43.05%   43.09%   +0.03%     
==========================================
  Files         635      635              
  Lines       33674    33715      +41     
  Branches     1516     1515       -1     
==========================================
+ Hits        14498    14528      +30     
- Misses      19037    19048      +11     
  Partials      139      139              

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