fix timeslice chaining in react embeddable control group (#188866)

While reviewing #188687, I noticed
that controls where still getting filtered by timeslider changes even
when chaining was disabled or the control was to the left of the
timeslider. This PR resolves this issue by only passing in timeslice
from `chaining$` instead of `controlGroupFetch$`.

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

examples/controls_example/public/react_controls/control_group/control_fetch/control_group_fetch.ts

@@ -37,9 +37,6 @@ export function controlGroupFetch$(
       }
       if (!parentIgnoreSettings?.ignoreTimerange && parentApi.timeRange$) {
         observables.push(parentApi.timeRange$);
-        if (parentApi.timeslice$) {
-          observables.push(parentApi.timeslice$);
-        }
       }
       if (apiPublishesReload(parentApi)) {
         observables.push(parentApi.reload$);
@@ -61,13 +58,7 @@ export function controlGroupFetch$(
         timeRange:
           parentIgnoreSettings?.ignoreTimerange || !parentApi.timeRange$
             ? undefined
-            : parentApi.timeslice$?.value
-            ? {
-                from: new Date(parentApi.timeslice$?.value[0]).toISOString(),
-                to: new Date(parentApi.timeslice$?.value[1]).toISOString(),
-                mode: 'absolute' as 'absolute',
-              }
-            : (parentApi as PublishesUnifiedSearch).timeRange$.value,
+            : parentApi.timeRange$.value,
       };
     })
   );