Graph (old): use timeField.config.interval to apply null insertion logic (#46069) (#46070)

(cherry picked from commit fa99143eee)

Co-authored-by: Leon Sorokin <leeoniya@gmail.com>

public/app/plugins/panel/graph/data_processor.ts

@@ -12,6 +12,7 @@ import {
 } from '@grafana/data';
 import TimeSeries from 'app/core/time_series2';
 import config from 'app/core/config';
+import { applyNullInsertThreshold } from '@grafana/ui/src/components/GraphNG/nullInsertThreshold';
 
 type Options = {
   dataList: DataFrame[];
@@ -30,13 +31,15 @@ export class DataProcessor {
     }
 
     for (let i = 0; i < dataList.length; i++) {
-      const series = dataList[i];
+      let series = dataList[i];
       const { timeField } = getTimeField(series);
 
       if (!timeField) {
         continue;
       }
 
+      series = applyNullInsertThreshold(series, timeField.name);
+
       for (let j = 0; j < series.fields.length; j++) {
         const field = series.fields[j];