fix(IT Wallet): [SIW-786] Fix CGN test (#5374)

## Short description
This PR fixes a failing CGN test by implementing #5367. It must be
merged as soon as possible instead of waiting for a rebase.

## How to test
Static checks.

ts/features/bonus/cgn/utils/__test__/dates.test.ts

@@ -1,9 +1,9 @@
+import MockDate from "mockdate";
 import { getCgnUserAgeRange } from "../dates";
 
 describe("getCgnUserAgeRange", () => {
   beforeAll(() => {
-    // eslint-disable-next-line functional/immutable-data
-    Date.now = jest.fn(() => new Date(Date.UTC(2022, 1, 1)).valueOf());
+    MockDate.set("2022-01-01");
   });
 
   it.each([