Elasticsearch: Refactor parse query (#60440)

* Refactor parse query to functions

* Move parsing to new file

* Create empty result variable and use it when returning early

* Fix linting

* Revert "Create empty result variable and use it when returning early"

This reverts commit 36a503f66e.

pkg/tsdb/elasticsearch/response_parser_test.go

@@ -1176,8 +1176,7 @@ func parseTestResponse(tsdbQueries map[string]string, responseBody string) (*bac
 		return nil, err
 	}
 
-	tsQueryParser := newTimeSeriesQueryParser()
-	queries, err := tsQueryParser.parse(tsdbQuery.Queries)
+	queries, err := parseQuery(tsdbQuery.Queries)
 	if err != nil {
 		return nil, err
 	}