Bugfix/tet 981 stova attendee ingestion fields

[DeanElliott96]

Description of change

Some attendees are not being ingested so the models have been relaxed with nulls and blanks to reflect the data model from live Stova Attendees.

Any attendees with fields missing which we do require are now skipped and logged as INFO instead of ERROR so sentry alerts are not raised.

Checklist

• Has this branch been rebased on top of the current main branch?
• Is the CircleCI build passing?

[code-review-doctor]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.63%. Comparing base (bebfa68) to head (6450cc4).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5969      +/-   ##
==========================================
- Coverage   96.65%   96.63%   -0.02%     
==========================================
  Files        1081     1082       +1     
  Lines       25394    25406      +12     
  Branches     1676     1678       +2     
==========================================
+ Hits        24544    24551       +7     
- Misses        694      698       +4     
- Partials      156      157       +1     

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