fix(tests): remove unused mock_tmp variable and apply ruff formatting

features/steps/cleanup_service_uncovered_lines_steps.py

@@ -438,7 +438,7 @@ def step_cleanup_cov_purge_sandboxes_cache_tracking(context: Context) -> None:
 
     # Create temporary stub directories that look like sandbox dirs
     tmp_dir = tempfile.mkdtemp()
-    sandbox_names = [f"ca-sandbox-plan{ i}-stub{i}" for i in range(2)]
+    sandbox_names = [f"ca-sandbox-plan{i}-stub{i}" for i in range(2)]
     sandbox_paths = []
     for name in sandbox_names:
         p = Path(tmp_dir) / name
@@ -483,9 +483,7 @@ def step_cleanup_cov_purge_empty_cache(context: Context) -> None:
         tempfile.gettempdir = fake_gettempdir
         # Patch Path.exists to return False so we hit the early-return path but
         # still want to verify cache is set to None
-        with patch(
-            "cleveragents.application.services.cleanup_service.tempfile"
-        ) as mock_tmp:
+        with patch("cleveragents.application.services.cleanup_service.tempfile"):
             # tempfile module was already imported in cleanup_service.py,
             # but we patched gettempdir directly above