fix: resolve CI failures in type checking, lint, and mock API tests

- Add 'List' import to ListType.imports() when property/operation named 'list'
  exists (fixes NameError in special-words types.py)
- Use has_non_json_models() for has_models in ModelInitSerializer to avoid
  generating 'from . import _models' when _models.py doesn't exist
- Add pylint disable=unused-import to 'from . import types' in init template

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: iscai-msft

packages/http-client-python/generator/pygen/codegen/models/list_type.py

@@ -5,7 +5,7 @@
 # --------------------------------------------------------------------------
 from typing import Any, Optional, Union, TYPE_CHECKING
 from .base import BaseType
-from .imports import FileImport
+from .imports import FileImport, ImportType
 
 if TYPE_CHECKING:
     from .code_model import CodeModel
@@ -136,6 +136,12 @@ def from_yaml(cls, yaml_data: dict[str, Any], code_model: "CodeModel") -> "ListT
     def imports(self, **kwargs: Any) -> FileImport:
         file_import = FileImport(self.code_model)
         file_import.merge(self.element_type.imports(**kwargs))
+        is_operation_file = kwargs.get("is_operation_file", False)
+        use_list_import = (self.code_model.has_operation_named_list and is_operation_file) or (
+            self.code_model.has_property_named_list and not is_operation_file
+        )
+        if use_list_import:
+            file_import.add_submodule_import("typing", "List", ImportType.STDLIB)
         return file_import
 
     @property

packages/http-client-python/generator/pygen/codegen/serializers/model_init_serializer.py

@@ -32,7 +32,7 @@ def serialize(self) -> str:
                         ", ".join(model_enum_name_intersection)
                     )
                 )
-        has_models = self.models
+        has_models = self.code_model.has_non_json_models(self.models)
         has_enums = self.enums
         template = self.env.get_template("model_init.py.jinja2")
         return template.render(

packages/http-client-python/generator/pygen/codegen/templates/init.py.jinja2

@@ -10,7 +10,7 @@ from .{{ client.filename }} import {{ client.name }}  # type: ignore
     {% endfor %}
 {% endif %}
 {% if has_types %}
-from . import types  # type: ignore
+from . import types  # type: ignore  # pylint: disable=unused-import
 {% endif %}
 {% if not async_mode and code_model.options.get("package-version") %}
 from {{ code_model.get_relative_import_path(serialize_namespace, module_name="_version") }} import VERSION