fix(server): non-nullable IsOptional (#3939)

* custom `IsOptional`

* added link to source

* formatting

* Update server/src/domain/domain.util.ts

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

* nullable birth date endpoint

* made `nullable` a property

* formatting

* removed unused dto

* updated decorator arg

* fixed album e2e tests

* add null tests for auth e2e

* add null test for person e2e

* fixed tests

* added null test for user e2e

* removed unusued import

* log key in test name

* chore: add note about mobile not being able to use the endpoint

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

server/test/fixtures/auth.stub.ts

@@ -1,12 +1,17 @@
 import { AuthUserDto } from '@app/domain';
 
-export const signupStub = {
+export const adminSignupStub = {
   firstName: 'Immich',
   lastName: 'Admin',
   email: 'admin@immich.app',
   password: 'Password123',
 };
 
+export const userSignupStub = {
+  ...adminSignupStub,
+  memoriesEnabled: true,
+};
+
 export const signupResponseStub = {
   id: expect.any(String),
   email: 'admin@immich.app',
@@ -22,6 +27,11 @@ export const loginStub = {
   },
 };
 
+export const changePasswordStub = {
+  password: 'Password123',
+  newPassword: 'Password1234',
+};
+
 export const authStub = {
   admin: Object.freeze<AuthUserDto>({
     id: 'admin_id',