DashboardScene: Add time picker keybindings (#78632)

* grafana/data: Add time range zoom out util

* Add keybindings for time range zoom out

* TimeRangePicker: change the way absolute time range is detected

* Depend on dashboard scene tructure rather

* Revert "grafana/data: Add time range zoom out util"

This reverts commit bc1602db57.

* Lint

* Lint

* dashboardSceneGraph tests

packages/grafana-data/src/datetime/rangeutil.ts

@@ -214,7 +214,7 @@ export const convertRawToRange = (
   return { from, to, raw: { from, to } };
 };
 
-function isRelativeTime(v: DateTime | string) {
+export function isRelativeTime(v: DateTime | string) {
   if (typeof v === 'string') {
     return v.indexOf('now') >= 0;
   }