extension_host: fix missing debug adapters (#31069)

Missed because of lack of rebase

Release Notes:

- N/A

crates/extension_host/src/wasm_host.rs

@@ -803,6 +803,7 @@ mod tests {
                 command: "echo".into(),
                 args: vec!["hello!".into()],
             }],
+            debug_adapters: Vec::new(),
         }
     }
 }