Add max and ultra reasoning efforts to the SDKs (#39662)

## What changed

- Add `max` and `ultra` to the TypeScript `ModelReasoningEffort` type.
- Add matching Python `ReasoningEffort` members and preserve them when SDK artifacts are regenerated.
- Update the Python model-selection examples to rank the new effort levels.

## Testing

- Cover serialization of both new Python enum members while continuing to accept unknown future values.

GitOrigin-RevId: 1412b77bdbb2530f5d38921cdea971dd34458353

sdk/python/scripts/update_sdk_artifacts.py

@@ -656,6 +656,8 @@ def _preserve_reasoning_effort_enum(out_path: Path) -> None:
     medium = "medium"
     high = "high"
     xhigh = "xhigh"
+    max = "max"
+    ultra = "ultra"
 
     @classmethod
     def _missing_(cls, value: object) -> ReasoningEffort | None: