[v11.4.x] Graphite: Fix issue where duplicated panels share same query object (#99100)

Graphite: Fix issue where duplicated panels share same query object (#99077)

(cherry picked from commit c0b3932168)

Co-authored-by: kay delaney <45561153+kaydelaney@users.noreply.github.com>

public/app/plugins/datasource/graphite/state/context.tsx

@@ -88,7 +88,7 @@ export const GraphiteQueryEditorContext = ({
   if (!state) {
     dispatch(
       actions.init({
-        target: query,
+        target: { ...query },
         datasource: datasource,
         range: range,
         templateSrv: getTemplateSrv(),