Move test file (#708)

* Initial

* Update

Author: BeatrixCohere

src/backend/tests/chat/test_tool_calls.py renamed to src/backend/tests/unit/chat/test_tool_calls.py

@@ -9,7 +9,7 @@
 from backend.config.tools import AVAILABLE_TOOLS, ToolName
 from backend.schemas.tool import ManagedTool
 from backend.services.context import Context
-from backend.tests.model_deployments.mock_deployments import MockCohereDeployment
+from backend.tests.unit.model_deployments.mock_deployments import MockCohereDeployment
 from backend.tools.base import BaseTool