[8.12] [ML] Fixes Single Metric Viewer's zoom settings in URL are not restored if URL specifies a forecast ID (#176969) (#177124)

# Backport

This will backport the following commits from `main` to `8.12`:
- [[ML] Fixes Single Metric Viewer's zoom settings in URL are not
restored if URL specifies a forecast ID
(#176969)](https://github.com/elastic/kibana/pull/176969)

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/ml/public/application/timeseriesexplorer/timeseriesexplorer.js

@@ -486,9 +486,13 @@ export class TimeSeriesExplorer extends React.Component {
                 stateUpdate.contextAggregationInterval,
                 bounds
               );
+
               if (
-                focusRange === undefined ||
-                this.previousSelectedForecastId !== this.props.selectedForecastId
+                // If the user's focus range is not defined (i.e. no 'zoom' parameter restored from the appState URL),
+                // then calculate the default focus range to use
+                zoom === undefined &&
+                (focusRange === undefined ||
+                  this.previousSelectedForecastId !== this.props.selectedForecastId)
               ) {
                 focusRange = calculateDefaultFocusRange(
                   autoZoomDuration,