Fix test: Use valid MCP reference in test_agent_kickoff_async_includes_platform_and_mcp_tools

- Change mcps parameter from ['test_mcp'] to ['crewai-amp:dummy'] to pass validation
- Add assertions to verify get_platform_tools and get_mcp_tools are called
- MCP references must start with 'https://' or 'crewai-amp:' per validation rules

Co-Authored-By: João <joao@crewai.com>

lib/crewai/tests/agents/test_agent_multimodal_kickoff.py

@@ -279,7 +279,7 @@ def test_agent_kickoff_async_includes_platform_and_mcp_tools(mock_lite_agent):
             goal="test goal",
             backstory="test backstory",
             apps=["test_app"],
-            mcps=["test_mcp"],
+            mcps=["crewai-amp:dummy"],
             multimodal=True,
         )
 
@@ -291,6 +291,9 @@ def test_agent_kickoff_async_includes_platform_and_mcp_tools(mock_lite_agent):
         call_kwargs = mock_lite_agent.call_args[1]
         tools = call_kwargs["tools"]
 
+        mock_platform_tools.assert_called_once()
+        mock_mcp_tools.assert_called_once()
+
         assert any(isinstance(tool, PlatformTool) for tool in tools)
         assert any(isinstance(tool, MCPTool) for tool in tools)
         assert any(isinstance(tool, AddImageTool) for tool in tools)