[ES|QL][Inspector] Display cluster details tab for CCS data sources (e…

…lastic#195373)

## Summary

It displays correctly the cluster details if they come in the response.
To test it you will need a CCS index as the `_clusters` property only
comes for these indexes.

Other than that it just works out of the bloom as the response is
exactly the same as the search api. If we were sending the response
correctly in the inspector (it wants: `rawResonse: {....}` and not just
the response as we get it), it would have worked without any change from
our side.

![image
(63)](https://github.com/user-attachments/assets/c3a93616-4a6d-468c-8968-e1f1692cffc1)

src/plugins/data/common/search/expressions/esql.ts

@@ -289,7 +289,7 @@ export const getEsqlFn = ({ getStartDependencies }: EsqlFnArguments) => {
                     }),
                   })
                   .json(params)
-                  .ok({ json: rawResponse, requestParams });
+                  .ok({ json: { rawResponse }, requestParams });
               },
               error(error) {
                 logInspectorRequest()