Api/contributor events

[thinknoack]

this PR is mostly about cleaning up and refactoring the code that was previously merged into Master, before Integrating the mutations to the UI

A few things were not working and there were different status for diff event types.

• refactored datasetEvents to handle resolutionStatus consistently
• added proper handling for contributorRequest, contributorResponse, and contributorCitation events
• processContributorRequest & processContributorCitation both use id lookup, not _id
• updated response creation and datacite updates for accepted requests
• cleaned up type guards and event mapping logic for better clarity

[codecov]

Codecov Report

❌ Patch coverage is 26.40000% with 184 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.96%. Comparing base (df90371) to head (80141e4).
⚠️ Report is 31 commits behind head on master.

Files with missing lines	Patch %	Lines
...euro-server/src/graphql/resolvers/datasetEvents.ts	0.84%	118 Missing ⚠️
...ges/openneuro-app/src/scripts/types/event-types.ts	0.00%	24 Missing ⚠️
...ipts/users/user-notification-accordion-actions.tsx	0.00%	17 Missing ⚠️
...cripts/users/user-notifications-accordion-body.tsx	0.00%	10 Missing ⚠️
...kages/openneuro-server/src/utils/datacite-utils.ts	86.79%	7 Missing ⚠️
.../src/scripts/users/user-notification-accordion.tsx	0.00%	6 Missing ⚠️
.../scripts/dataset/components/dataset-event-item.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3595      +/-   ##
==========================================
+ Coverage   42.93%   42.96%   +0.02%     
==========================================
  Files         633      633              
  Lines       33142    33244     +102     
  Branches     1479     1482       +3     
==========================================
+ Hits        14231    14283      +52     
- Misses      18772    18822      +50     
  Partials      139      139              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.