[ML] AIOps: Fix relative time bound support in the chart preview (#160121)

## Summary

- Fixes relative time range support in the Change Point Detection UI. 
- Enables functional tests (resolves
https://github.com/elastic/kibana/issues/158851)


### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

x-pack/plugins/aiops/public/components/change_point_detection/change_point_detection_context.tsx

@@ -120,7 +120,7 @@ export const ChangePointDetectionContextProvider: FC = ({ children }) => {
   >({});
   const [bucketInterval, setBucketInterval] = useState<TimeBucketsInterval>();
 
-  const timeRange = useTimeRangeUpdates();
+  const timeRange = useTimeRangeUpdates(true);
 
   useEffect(function updateIntervalOnTimeBoundsChange() {
     const timeUpdateSubscription = timefilter

x-pack/plugins/aiops/public/components/change_point_detection/use_common_chart_props.ts

@@ -30,7 +30,7 @@ export const useCommonChartProps = ({
   annotation: ChangePointAnnotation;
   previewMode?: boolean;
 }): Partial<TypedLensByValueInput> => {
-  const timeRange = useTimeRangeUpdates();
+  const timeRange = useTimeRangeUpdates(true);
   const { dataView } = useDataSource();
   const { bucketInterval, resultQuery, resultFilters } = useChangePointDetectionContext();
 

x-pack/test/functional/apps/aiops/change_point_detection.ts

@@ -16,8 +16,7 @@ export default function ({ getPageObjects, getService }: FtrProviderContext) {
   // aiops lives in the ML UI so we need some related services.
   const ml = getService('ml');
 
-  // FLAKY: https://github.com/elastic/kibana/issues/158851
-  describe.skip('change point detection', async function () {
+  describe('change point detection', async function () {
     before(async () => {
       await esArchiver.loadIfNeeded('x-pack/test/functional/es_archives/ml/ecommerce');
       await ml.testResources.createIndexPatternIfNeeded('ft_ecommerce', 'order_date');
@@ -64,6 +63,7 @@ export default function ({ getPageObjects, getService }: FtrProviderContext) {
       await aiops.changePointDetectionPage.clickUseFullDataButton();
       await aiops.changePointDetectionPage.selectMetricField(0, 'products.discount_amount');
       await aiops.changePointDetectionPage.selectSplitField(0, 'geoip.city_name');
+      await aiops.changePointDetectionPage.getTable(0).waitForTableToLoad();
       const result = await aiops.changePointDetectionPage.getTable(0).parseTable();
       expect(result.length).to.eql(5);
       // assert asc sorting by p_value is applied