[Cherry-pick] Change Paddle CI-Cverage Python3.8 [32515] (#32960)

Change Paddle CI-Cverage Python3.8 Cherry-pick 32515

paddle/scripts/paddle_build.sh

@@ -1450,6 +1450,7 @@ function parallel_test() {
     mkdir -p ${PADDLE_ROOT}/build
     cd ${PADDLE_ROOT}/build
     pip install ${PADDLE_ROOT}/build/python/dist/*whl
+    cp ${PADDLE_ROOT}/build/python/paddle/fluid/tests/unittests/op_test.py ${PADDLE_ROOT}/build/python
     if [ "$WITH_GPU" == "ON" ] || [ "$WITH_ROCM" == "ON" ];then
         parallel_test_base_gpu
     else