fix: toolgroups unregister (#1704)

# What does this PR do?
FAILED
tests/integration/tools/test_tools.py::test_toolsgroups_unregister[None]
- AttributeError: 'coroutine' object has no attribute 'data'

## Test Plan
LLAMA_STACK_CONFIG=fireworks pytest -s -v
tests/integration/tools/test_tools.py
---
[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with
[ReviewStack](https://reviewstack.dev/meta-llama/llama-stack/pull/1704).
* #1705
* __->__ #1704

llama_stack/distribution/routers/routing_tables.py

@@ -575,7 +575,7 @@ class ToolGroupsRoutingTable(CommonRoutingTableImpl, ToolGroups):
         tool_group = await self.get_tool_group(toolgroup_id)
         if tool_group is None:
             raise ValueError(f"Tool group {toolgroup_id} not found")
-        tools = await self.list_tools(toolgroup_id).data
+        tools = (await self.list_tools(toolgroup_id)).data
         for tool in tools:
             await self.unregister_object(tool)
         await self.unregister_object(tool_group)

tests/integration/tools/test_tools.py

@@ -0,0 +1,12 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+
+def test_toolsgroups_unregister(llama_stack_client):
+    client = llama_stack_client
+    client.toolgroups.unregister(
+        toolgroup_id="builtin::websearch",
+    )