Skip legacy/ to reduce CI test workload.

PiperOrigin-RevId: 481753314

official/utils/testing/scripts/presubmit.sh

@@ -32,7 +32,7 @@ py_test() {
 
   echo "===========Running Python test============"
   # Skipping Ranking tests, TODO(b/189265753) remove it once the issue is fixed.
-  for test_file in `find official/ -name '*test.py' -print | grep -v 'official/recommendation/ranking'`
+  for test_file in `find official/ -name '*test.py' -print | grep -v -E 'official/(recommendation/ranking|legacy)'`
   do
     echo "####=======Testing ${test_file}=======####"
     ${PY_BINARY} "${test_file}"