refact: individual vital_status as fk

[v-rocheleau]

Allow re-use of VitalStatus for individuals with a vital_status that only has the status field.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.27%. Comparing base (5c8c37c) to head (7044264).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #507   +/-   ##
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  Coverage    88.27%   88.27%           
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  Files          128      128           
  Lines         4640     4640           
  Branches       684      684           
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  Hits          4096     4096           
  Misses         390      390           
  Partials       154      154           

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[davidlougheed]

lgtm. I'm assuming ingestion correctly deduplicates these?

[noctillion]

Ir works well! lgtm

[v-rocheleau]

lgtm. I'm assuming ingestion correctly deduplicates these?

Yes, the previous VitalStatus PR has the deduplication logic but it didn't work with a one-to-one relationship.