Restore default instance type. Tweak integ test.

Author: Joseph Zhang

src/sagemaker/serve/builder/model_builder.py

@@ -274,7 +274,7 @@ class ModelBuilder(Triton, DJL, JumpStart, TGI, Transformers, TensorflowServing,
         metadata={"help": "Define the s3 location where you want to upload the model package"},
     )
     instance_type: Optional[str] = field(
-        default=None,
+        default="ml.c5.xlarge",
         metadata={"help": "Define the instance_type of the endpoint"},
     )
     schema_builder: Optional[SchemaBuilder] = field(

tests/integ/sagemaker/serve/test_schema_builder.py

@@ -34,7 +34,9 @@
 
 def test_model_builder_happy_path_with_only_model_id_text_generation(sagemaker_session):
     model_builder = ModelBuilder(
-        model="HuggingFaceH4/zephyr-7b-beta", sagemaker_session=sagemaker_session
+        model="HuggingFaceH4/zephyr-7b-beta",
+        sagemaker_session=sagemaker_session,
+        instance_type=None,
     )
 
     model = model_builder.build(sagemaker_session=sagemaker_session)