Remove people model

[pdelboca]

This PR removes the old Person model.

Follow up of #1096 #1098 #1100

This is the last "model content managed" piece of code that we have in the system.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.24%. Comparing base (8b69fb9) to head (0455ae5).
Report is 45 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1102      +/-   ##
===========================================
- Coverage    88.78%   88.24%   -0.55%     
===========================================
  Files           99       90       -9     
  Lines         1222      910     -312     
  Branches        50       38      -12     
===========================================
- Hits          1085      803     -282     
+ Misses         135      107      -28     
+ Partials         2        0       -2     

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