feat(server): conditionally run facial recognition nightly (#11080)

* only run nightly if new person

* add tests

* use string instead of date

* update sql

* update tests

* simplify condition

server/test/repositories/person.repository.mock.ts

@@ -29,5 +29,6 @@ export const newPersonRepositoryMock = (): Mocked<IPersonRepository> => {
     getFaceById: vitest.fn(),
     getFaceByIdWithAssets: vitest.fn(),
     getNumberOfPeople: vitest.fn(),
+    getLatestFaceDate: vitest.fn(),
   };
 };