DataLinks: Fix double dollar-sign bug in data-links editor (#58096)

* fix template variable bug

* fix bug when adding vars before existing vars

* take 2--remove includeDollarSign logic

* take 3-add includeDollarSign logic for template vars

packages/grafana-ui/src/components/DataLinks/DataLinkInput.tsx

@@ -141,7 +141,7 @@ export const DataLinkInput: React.FC<DataLinkInputProps> = memo(
       if (item.origin !== VariableOrigin.Template || item.value === DataLinkBuiltInVars.includeVars) {
         editor.insertText(`${includeDollarSign ? '$' : ''}\{${item.value}}`);
       } else {
-        editor.insertText(`\${${item.value}:queryparam}`);
+        editor.insertText(`${includeDollarSign ? '$' : ''}\{${item.value}:queryparam}`);
       }
 
       setLinkUrl(editor.value);