fix: remove unsupported -q flag from pre-commit clean in run.sh

pre-commit clean does not accept a -q/--quiet argument; passing it
caused the CI step to exit immediately with exit code 2.

Agent-Logs-Url: https://github.com/cpp-linter/cpp-linter-hooks/sessions/99350251-8df1-4994-9492-ca886e0e959f

Co-authored-by: shenxianpeng <3353385+shenxianpeng@users.noreply.github.com>

Author: Copilot

testing/run.sh

@@ -28,7 +28,7 @@ run_test() {
     local expect_nonzero="$4"
 
     echo "---- $description ----"
-    uvx pre-commit clean -q
+    uvx pre-commit clean
 
     local output
     # shellcheck disable=SC2086  # word-splitting of $files is intentional