fix(formatter): use primitive type instead of schema name in get_response_type (#3723)

When a named component schema has a primitive type (e.g. type: string),
get_response_type() used schema_name() directly, emitting the schema name
as a class type and adding a model import — but no class is generated for
primitive schemas, causing a compile error in generated examples.

Fix: check simple_type() first; if the schema resolves to a primitive,
use that type and suppress the model import. Consistent with how
type_to_java() already guards against this case.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: walidcavelius

.generator/src/generator/formatter.py

@@ -692,11 +692,15 @@ def get_response_type(schema, version):
         else:
             api_response_type = f"List<{simple_type(nested_schema)}>"
     else:
+        primitive = simple_type(response_schema)
         name = schema_name(response_schema)
-        if name:
+        if name and not primitive:
             api_response_type = name
         else:
-            api_response_type = simple_type(response_schema)
+            # Named primitive schemas (e.g. type: string) don't produce a class —
+            # use the primitive type directly and suppress the model import.
+            api_response_type = primitive
+            name = None
 
     if name:
         return api_response_type, f"com.datadog.api.client.{version}.model.{name}"