Filter METRIC_ graph templates on CEE

These entries are not filtered out of the checkmk endpoint, because the
GUI crawler does require some single metric templates. The connector has
its dedicated single metric selector.

Author: Óscar Nájera

src/components/fields.tsx

@@ -103,11 +103,20 @@ export const GraphSelect = (props: EditorProps) => {
   const label = titleCase(graphMode);
   const autocompleter = vsAutocomplete(props.datasource, completionVS);
 
+  const autocompleter_wrap = (inputValue: string) =>
+    autocompleter(inputValue).then((choices) => {
+      if (graphMode === 'template') {
+        return choices.filter(({ value }: SelectableValue<string>) => value && !value.startsWith('METRIC_'));
+      } else {
+        return choices;
+      }
+    });
+
   return (
     <>
       <GraphType contextPath="params.graphMode" {...props} autocompleter={(_) => new Promise(() => ({}))} />
       <InlineField labelWidth={14} label={label}>
-        <AsyncAutocomplete autocompleter={autocompleter} contextPath={'params.graph_name'} {...props} />
+        <AsyncAutocomplete autocompleter={autocompleter_wrap} contextPath={'params.graph_name'} {...props} />
       </InlineField>
     </>
   );