[SPARK-31849][PYTHON][SQL][FOLLOW-UP] More correct error message in Python UDF exception message

### What changes were proposed in this pull request?

This PR proposes to fix wordings in the Python UDF exception error message from:

From:

> An exception was thrown from Python worker in the executor. The below is the Python worker stacktrace.

To:

> An exception was thrown from the Python worker. Please see the stack trace below.

It removes "executor" because Python worker is technically a separate process, and remove the duplicated wording "Python worker" .

### Why are the changes needed?

To give users better exception messages.

### Does this PR introduce _any_ user-facing change?

No, it's in unreleased branches only. If RC3 passes, yes, it will change the exception message.

### How was this patch tested?

Manually tested.

Closes #28762 from HyukjinKwon/SPARK-31849-followup-2.

Authored-by: HyukjinKwon <[email protected]>
Signed-off-by: HyukjinKwon <[email protected]>
(cherry picked from commit e289140)
Signed-off-by: HyukjinKwon <[email protected]>

Author: HyukjinKwon

python/pyspark/sql/utils.py

@@ -116,8 +116,8 @@ def convert_exception(e):
             # To make sure this only catches Python UDFs.
             and any(map(lambda v: "org.apache.spark.sql.execution.python" in v.toString(),
                         c.getStackTrace()))):
-        msg = ("\n  An exception was thrown from Python worker in the executor. "
-               "The below is the Python worker stacktrace.\n%s" % c.getMessage())
+        msg = ("\n  An exception was thrown from the Python worker. "
+               "Please see the stack trace below.\n%s" % c.getMessage())
         return PythonException(msg, stacktrace)
     return UnknownException(s, stacktrace, c)