Python: Fix kernel parameter metadata input type arg to call type_ (#10603)

### Motivation and Context

To address a typing issue, we updated the kernel parameter metadata so
that the input type argument now calls `type` (configured as an alias)
rather than the model’s parameter `type_`. Previously, setting the alias
did not update the underlying `type_` attribute, leaving it as `None`.
As a result, when generating the JSON schema, the `parameter_type` was
omitted, causing some customers who sent `KernelFunctionMetadata` to the
OpenAI model to receive a 400 error due to a malformed schema.

<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
-->

### Description

Revert the change and add a unit test to make sure we check for the
expected schema.

<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->

### Contribution Checklist

<!-- Before submitting this PR, please make sure: -->

- [X] The code builds clean without any errors or warnings
- [X] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [X] All unit tests pass, and I have added new tests where possible
- [X] I didn't break anyone 😄

Author: moonbox3

python/semantic_kernel/prompt_template/prompt_template_config.py

@@ -83,7 +83,7 @@ def get_kernel_parameter_metadata(self) -> Sequence[KernelParameterMetadata]:
                 name=variable.name,
                 description=variable.description,
                 default_value=variable.default,
-                type=variable.json_schema,  # TODO (moonbox3): update to handle complex JSON schemas
+                type_=variable.json_schema,  # TODO (moonbox3): update to handle complex JSON schemas # type: ignore
                 is_required=variable.is_required,
             )
             for variable in self.input_variables

python/tests/unit/prompt_template/test_prompt_templates.py

@@ -326,3 +326,4 @@ def test_from_yaml_with_function_choice_behavior():
 def test_multiple_param_in_prompt():
     func = KernelFunctionFromPrompt("test", prompt="{{$param}}{{$param}}")
     assert len(func.parameters) == 1
+    assert func.metadata.parameters[0].schema_data == {"type": "object"}