fix(server): correct person birth date across timezones (#11369)

* fix(server): correct person birth date across timezones

* fix test

* update e2e tests

* use Optional decorator

server/src/entities/person.entity.ts

@@ -33,7 +33,7 @@ export class PersonEntity {
   name!: string;
 
   @Column({ type: 'date', nullable: true })
-  birthDate!: Date | null;
+  birthDate!: string | null;
 
   @Column({ default: '' })
   thumbnailPath!: string;