DataSource not found when running SQL expression on shared Dashboard Source

### What happened? When I want to reuse a sql query between panels and want to run a sql expression on the second panel I get a DataSource not found exception. ### What did you expect to happen? I expected to be able to run a sql expression on the data injected into the panel by accessing the shared result. ### Did this work before? sql expression under feature tag ### How do we reproduce it? 1. Create Panel A with TestData as Datasource 2. Go to Panel B set Datasource to "mixed" 3. Select "Dashboard" as Datasource for Query A 4. add sql expression: "SELECT * FROM A LIMIT 10" 5. Exception "Datasource not found" will be thrown ### Is the bug inside a dashboard panel? _No response_ ### Environment (with versions)? Grafana: Grafana v12.0.2 (5bda17e7c1) OS: Windows Browser: Chrome ### Grafana platform? A downloaded binary ### Datasource(s)? TestDatasource & SQL Expression