Explore: Introduces PanelData to ExploreItemState (#18804)

* WIP: inital POC

* Wip: Moving forward

* Wip

* Refactor: Makes loading indicator work for Prometheus

* Refactor: Reverts prom observable queries because they did not work for multiple targets

* Refactor: Transforms all epics into thunks

* Fix: Fixes scanning

* Fix: Fixes so that Instant and TimeSeries Prom query loads in parallel

* Fix: Fixes negation logic error

* Wip: Introduces PanelData as a carries for query responses

* Refactor: Makes errors work again

* Refactor: Simplifies code somewhat and removes comments

* Tests: Fixes broken tests

* Fix query latency

* Remove unused code

public/app/features/explore/LogsContainer.tsx

@@ -11,7 +11,6 @@ import {
   LogsModel,
   LogRowModel,
   LogsDedupStrategy,
-  LoadingState,
   TimeRange,
 } from '@grafana/data';
 
@@ -143,14 +142,13 @@ function mapStateToProps(state: StoreState, { exploreId }: { exploreId: string }
   const {
     logsHighlighterExpressions,
     logsResult,
-    loadingState,
+    loading,
     scanning,
     datasourceInstance,
     isLive,
     range,
     absoluteRange,
   } = item;
-  const loading = loadingState === LoadingState.Loading || loadingState === LoadingState.Streaming;
   const { dedupStrategy } = exploreItemUIStateSelector(item);
   const dedupedResult = deduplicatedLogsSelector(item);
   const timeZone = getTimeZone(state.user);