Elasticsearch: Add error source for DataQuery (#77386)

* WIP

* Refactor, plus update source of error in response_parser

* Adjust test

* Use methods and httpclient from errorsource

* Update pkg/tsdb/elasticsearch/data_query.go

Co-authored-by: Scott Lepper <scott.lepper@gmail.com>

* Return nil error

* Fix test

* Fix integration test

---------

Co-authored-by: Scott Lepper <scott.lepper@gmail.com>

pkg/tests/api/elasticsearch/elasticsearch_test.go

@@ -95,7 +95,7 @@ func TestIntegrationElasticsearch(t *testing.T) {
 		resp, err := http.Post(u, "application/json", buf1)
 		require.NoError(t, err)
 
-		require.Equal(t, http.StatusInternalServerError, resp.StatusCode)
+		require.Equal(t, http.StatusBadRequest, resp.StatusCode)
 		t.Cleanup(func() {
 			err := resp.Body.Close()
 			require.NoError(t, err)