fix(sdk): fix builder pattern to actually work with default values

In previous versions the builder pattern required all values to be set.
This has not been fixed, so that default values are allowed.

crates/dagger-core/src/engine.rs

@@ -25,28 +25,3 @@ impl Engine {
         self.from_cli(cfg).await
     }
 }
-
-#[cfg(test)]
-mod tests {
-    use crate::{config::Config, connect_params::ConnectParams};
-
-    use super::Engine;
-
-    // TODO: these tests potentially have a race condition
-    #[tokio::test]
-    async fn engine_can_start() {
-        let engine = Engine::new();
-        let params = engine
-            .start(&Config::new(None, None, None, None))
-            .await
-            .unwrap();
-
-        assert_ne!(
-            params.0,
-            ConnectParams {
-                port: 123,
-                session_token: "123".into()
-            }
-        )
-    }
-}