Explore/Loki: Fix field type in table for instant queries (#25907)

* Update field type for instant queries to number

* Remove fieldtype as in prometheus

* Revert "Remove fieldtype as in prometheus"

This reverts commit f887ad1125deb1053e33f7ef385d5f518ac27892.

public/app/plugins/datasource/loki/result_transformer.ts

@@ -207,7 +207,7 @@ export function lokiResultsToTableModel(
   table.columns = [
     { text: 'Time', type: FieldType.time },
     ...sortedLabels.map(label => ({ text: label, filterable: true })),
-    { text: resultCount > 1 || valueWithRefId ? `Value #${refId}` : 'Value', type: FieldType.time },
+    { text: resultCount > 1 || valueWithRefId ? `Value #${refId}` : 'Value', type: FieldType.number },
   ];
 
   // Populate rows, set value to empty string when label not present.