Make all fields optional on entities (#121)

* Make all fields optional on entities

* Rewrite tests

* Add test on TableHeader Cancel button

front/src/pages/people/__tests__/People.test.tsx

@@ -18,7 +18,7 @@ jest.mock('../../../apollo', () => {
         variables: GraphqlMutationPerson;
       }) => {
         const gqlPerson = arg.variables as unknown as GraphqlQueryPerson;
-        return { data: personInterface.mapPerson(gqlPerson) };
+        return { data: personInterface.mapToPerson(gqlPerson) };
       },
     },
   };