[BREAKING] Python: Move single-config fluent methods to constructor parameters (#3693)

* Move single-config fluent methods to constructor parameters

* Updates

* Adjust magentic and group chat

python/samples/getting_started/orchestrations/magentic_checkpoint.py

@@ -76,18 +76,14 @@ def build_workflow(checkpoint_storage: FileCheckpointStorage):
 
     # The builder wires in the Magentic orchestrator, sets the plan review path, and
     # stores the checkpoint backend so the runtime knows where to persist snapshots.
-    return (
-        MagenticBuilder()
-        .participants([researcher, writer])
-        .with_plan_review()
-        .with_manager(
-            agent=manager_agent,
-            max_round_count=10,
-            max_stall_count=3,
-        )
-        .with_checkpointing(checkpoint_storage)
-        .build()
-    )
+    return MagenticBuilder(
+        participants=[researcher, writer],
+        enable_plan_review=True,
+        checkpoint_storage=checkpoint_storage,
+        manager_agent=manager_agent,
+        max_round_count=10,
+        max_stall_count=3,
+    ).build()
 
 
 async def main() -> None: