test(zone.js): reduce flakiness of a timer-related test

This commit updates a flaky test to increase the amount of work (more `for` loop iterations) to minimize the chance of getting the same timestamp after that work.

Author: AndrewKushnir

packages/zone.js/test/jest/jest.spec.js

@@ -141,7 +141,7 @@ describe('jest modern fakeTimers with zone.js fakeAsync', () => {
     let d = fakeAsyncZoneSpec.getRealSystemTime();
     jest.setSystemTime(d);
     expect(Date.now()).toEqual(d);
-    for (let i = 0; i < 100000; i++) {}
+    for (let i = 0; i < 10_000_000; i++) {}
     expect(fakeAsyncZoneSpec.getRealSystemTime()).not.toEqual(d);
     d = fakeAsyncZoneSpec.getRealSystemTime();
     let timeoutTriggered = false;