Elasticsearch: Use interval provided by data request in backend (#60480)

* Elasticsearch: Remove interval caulation and use interval provises by grafana

* Remove redundant code

* Adjust snapshot tests

* Update test

* Fix lint

pkg/tsdb/elasticsearch/parse_query.go

@@ -26,7 +26,8 @@ func parseQuery(tsdbQuery []backend.DataQuery) ([]*Query, error) {
 			return nil, err
 		}
 		alias := model.Get("alias").MustString("")
-		interval := model.Get("interval").MustString("")
+		intervalMs := model.Get("intervalMs").MustInt64(0)
+		interval := q.Interval
 
 		queries = append(queries, &Query{
 			TimeField:     timeField,
@@ -35,6 +36,7 @@ func parseQuery(tsdbQuery []backend.DataQuery) ([]*Query, error) {
 			Metrics:       metrics,
 			Alias:         alias,
 			Interval:      interval,
+			IntervalMs:    intervalMs,
 			RefID:         q.RefID,
 			MaxDataPoints: q.MaxDataPoints,
 		})