[QA][refactor] Use ui settings - discover histogram

Use ui settings instead of setting absolute range
for timepicker.

Stacked on top of: #114530

test/functional/apps/discover/_discover_histogram.ts

@@ -40,10 +40,12 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
         'test/functional/fixtures/es_archiver/long_window_logstash_index_pattern'
       );
       await security.testUser.restoreDefaults();
+      await PageObjects.common.unsetTime();
     });
 
-    async function prepareTest(fromTime: string, toTime: string, interval?: string) {
-      await PageObjects.timePicker.setAbsoluteRange(fromTime, toTime);
+    async function prepareTest(from: string, to: string, interval?: string) {
+      await PageObjects.common.setTime({ from, to });
+      await PageObjects.common.navigateToApp('discover');
       await PageObjects.discover.waitUntilSearchingHasFinished();
       if (interval) {
         await PageObjects.discover.setChartInterval(interval);

test/functional/page_objects/common_page.ts

@@ -11,7 +11,6 @@ import expect from '@kbn/expect';
 // @ts-ignore
 import fetch from 'node-fetch';
 import { getUrl } from '@kbn/test';
-import moment from 'moment';
 import { FtrService } from '../ftr_provider_context';
 
 interface NavigateProps {
@@ -503,30 +502,11 @@ export class CommonPageObject extends FtrService {
     }
   }
 
-  formatTime(time: TimeStrings, fmt: string = 'MMM D, YYYY @ HH:mm:ss.SSS') {
-    return Object.keys(time)
-      .map((x) => moment(time[x], [fmt]).format())
-      .reduce(
-        (acc, curr, idx) => {
-          if (idx === 0) acc.from = curr;
-          acc.to = curr;
-          return acc;
-        },
-        { from: '', to: '' }
-      );
-  }
-
   async setTime(time: { from: string; to: string }) {
-    await this.kibanaServer.uiSettings.replace({
-      'timepicker:timeDefaults': JSON.stringify(this.formatTime(time)),
-    });
+    await this.kibanaServer.uiSettings.replace({ 'timepicker:timeDefaults': JSON.stringify(time) });
   }
 
   async unsetTime() {
     await this.kibanaServer.uiSettings.unset('timepicker:timeDefaults');
   }
 }
-export interface TimeStrings extends Record<string, any> {
-  from: string;
-  to: string;
-}