[OSCI] [FIX] time conversion unit test bug (#5174) (#5220)

* fix time conversion test bug
* Fix wrong test case

---------

Signed-off-by: Thanh <lechithanh2003@gmail.com>
Signed-off-by: Anan Zhuang <ananzh@amazon.com>
Signed-off-by: Miki <miki@amazon.com>
Co-authored-by: Anan Zhuang <ananzh@amazon.com>
Co-authored-by: Miki <miki@amazon.com>
Co-authored-by: Sean Neumann <1413295+seanneumann@users.noreply.github.com>
(cherry picked from commit 336dce6)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/plugins/discover/public/application/components/chart/utils/point_series.test.ts

@@ -51,8 +51,8 @@ describe('buildPointSeriesData', () => {
     expect(result.ordered.interval.asHours()).toBe(1);
     expect(result.ordered.intervalOpenSearchUnit).toBe('h');
     expect(result.ordered.intervalOpenSearchValue).toBe(1);
-    expect(result.ordered.min.format()).toBe('2023-01-01T00:00:00+00:00');
-    expect(result.ordered.max.format()).toBe('2023-01-02T00:00:00+00:00');
+    expect(result.ordered.min.format()).toBe(moment('2023-01-01T00:00:00+00:00').format());
+    expect(result.ordered.max.format()).toBe(moment('2023-01-02T00:00:00+00:00').format());
     expect(result.yAxisLabel).toEqual('Y Axis');
     expect(result.values).toEqual([
       { x: 10, y: 100 },