fix: remove sk tool adapter plugin name (#5444)

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## Why are these changes needed?

<!-- Please give a short summary of the change and the problem this
solves. -->

Semantic kernel prepends the plugin name to the tool name when passing
the tools to model clients and this is causing a mismatch between tool
names in SK and the AssistantAgent. Since plugin names are optional, we
have opted to remove it.

## Related issue number

<!-- For example: "Closes #1234" -->

Closes #5420 

## Checks

- [ ] I've included any doc changes needed for
https://microsoft.github.io/autogen/. See
https://microsoft.github.io/autogen/docs/Contribute#documentation to
build and test documentation locally.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.

---------

Co-authored-by: Leonardo Pinheiro <lpinheiro@microsoft.com>

python/packages/autogen-ext/src/autogen_ext/models/semantic_kernel/_sk_chat_completion_adapter.py

@@ -313,7 +313,7 @@ class SKChatCompletionAdapter(ChatCompletionClient):
         for tool in tools:
             if isinstance(tool, BaseTool):
                 # Convert Tool to KernelFunction using KernelFunctionFromTool
-                kernel_function = KernelFunctionFromTool(tool, plugin_name="autogen_tools")  # type: ignore
+                kernel_function = KernelFunctionFromTool(tool)  # type: ignore
                 self._tools_plugin.functions[tool.schema["name"]] = kernel_function
 
     def _process_tool_calls(self, result: ChatMessageContent) -> list[FunctionCall]:

python/packages/autogen-ext/src/autogen_ext/tools/semantic_kernel/_kernel_function_from_tool.py

@@ -106,7 +106,7 @@ class KernelFunctionFromTool(KernelFunction):
             return_parameter=return_param,
             is_prompt=False,
             is_asynchronous=True,
-            plugin_name=plugin_name or "",
+            plugin_name=plugin_name,
         )
         super().__init__(metadata=metadata)
         self._tool = tool

python/packages/autogen-ext/tests/models/test_sk_chat_completion_adapter.py

@@ -71,7 +71,7 @@ def sk_client() -> AzureChatCompletion:
                             FunctionCallContent(
                                 id="call_UwVVI0iGEmcPwmKUigJcuuuF",
                                 function_name="calculator",
-                                plugin_name="autogen_tools",
+                                plugin_name=None,
                                 arguments="{}",
                             )
                         ],
@@ -113,7 +113,7 @@ def sk_client() -> AzureChatCompletion:
                             FunctionCallContent(
                                 id="call_n8135GXc2kbiaaDdpImsB1VW",
                                 function_name="calculator",
-                                plugin_name="autogen_tools",
+                                plugin_name=None,
                                 arguments="",
                                 content_type="function_call",  # type: ignore
                             )