Elasticsearch: Fix where name of frame is set (#64233)

* Elasticsearch: Use displayName field for naming

* Change solution to frame.Name to be backward compatible

* Fix snapshot tests

* Use Time and Value for time and value fields

* Use variables from grafana-plugin-sdk-go for name

pkg/tsdb/elasticsearch/testdata/trimedges_string.golden.jsonc

@@ -7,10 +7,10 @@
 //          0
 //      ]
 //  }
-//  Name: 
+//  Name: Count
 //  Dimensions: 2 Fields by 3 Rows
 //  +-------------------------------+------------------+
-//  | Name: time                    | Name: value      |
+//  | Name: Time                    | Name: Value      |
 //  | Labels:                       | Labels:          |
 //  | Type: []time.Time             | Type: []*float64 |
 //  +-------------------------------+------------------+
@@ -26,6 +26,7 @@
   "frames": [
     {
       "schema": {
+        "name": "Count",
         "meta": {
           "type": "timeseries-multi",
           "typeVersion": [
@@ -35,23 +36,20 @@
         },
         "fields": [
           {
-            "name": "time",
+            "name": "Time",
             "type": "time",
             "typeInfo": {
               "frame": "time.Time"
             }
           },
           {
-            "name": "value",
+            "name": "Value",
             "type": "number",
             "typeInfo": {
               "frame": "float64",
               "nullable": true
             },
-            "labels": {},
-            "config": {
-              "displayNameFromDS": "Count"
-            }
+            "labels": {}
           }
         ]
       },