events: fix events create and serilaize choice fields

[sainak]

Proposed Changes

• fix events not created
• serialize choice fields display

Architecture changes

• Remove this section if not used

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (63ff210) 61.86% compared to head (48ea2d5) 61.83%.

Files	Patch %	Lines
care/facility/events/handler.py	88.23%	1 Missing and 1 partial ⚠️
care/utils/event_utils.py	85.71%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1897      +/-   ##
==========================================
- Coverage   61.86%   61.83%   -0.04%     
==========================================
  Files         221      221              
  Lines       12145    12163      +18     
  Branches     1728     1735       +7     
==========================================
+ Hits         7514     7521       +7     
- Misses       4324     4334      +10     
- Partials      307      308       +1     

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[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ IntegrityError: null value in column "consultation_id" violates not-null constraint /api/v1/patient/{patient_external_id}/notes/ View Issue

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