[SPARK-52470][TESTS][FOLLOWUP] Fix test failure caused by import connect in pure classic testing envs

### What changes were proposed in this pull request?
 Fix test failure caused by import connect in pure classic testing envs

### Why are the changes needed?
to fix failures in scheduled jobs like
https://github.com/apache/spark/actions/runs/15746558966/job/44384032554

### Does this PR introduce _any_ user-facing change?
no, test-only

### How was this patch tested?
will monitor the scheduled jobs

### Was this patch authored or co-authored using generative AI tooling?
no

Closes #51220 from zhengruifeng/test_grpc.

Authored-by: Ruifeng Zheng <[email protected]>
Signed-off-by: Ruifeng Zheng <[email protected]>

Author: zhengruifeng

python/pyspark/ml/util.py

@@ -40,7 +40,6 @@
 from contextlib import contextmanager
 
 from pyspark import since
-from pyspark.errors.exceptions.connect import SparkException
 from pyspark.ml.common import inherit_doc
 from pyspark.sql import SparkSession
 from pyspark.sql.utils import is_remote
@@ -319,6 +318,8 @@ def remote_call() -> Any:
                 return deserialize(properties)
 
         if is_remote() and "PYSPARK_NO_NAMESPACE_SHARE" not in os.environ:
+            from pyspark.errors.exceptions.connect import SparkException
+
             try:
                 return remote_call()
             except SparkException as e: