[SPARK-47933][PYTHON][TESTS][FOLLOW-UP] Enable doctest pyspark.sql.connect.column

### What changes were proposed in this pull request?
Enable doctest `pyspark.sql.connect.column`

### Why are the changes needed?
test coverage

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

### How was this patch tested?
manually check:

I manually broke some doctests in `Column`, then found `pyspark.sql.connect.column` didn't fail:
```
(spark_dev_312) ➜  spark git:(master) ✗ python/run-tests -k --python-executables python3 --testnames 'pyspark.sql.classic.column'
Running PySpark tests. Output is in /Users/ruifeng.zheng/Dev/spark/python/unit-tests.log
Will test against the following Python executables: ['python3']
Will test the following Python tests: ['pyspark.sql.classic.column']
python3 python_implementation is CPython
python3 version is: Python 3.12.2
Starting test(python3): pyspark.sql.classic.column (temp output: /Users/ruifeng.zheng/Dev/spark/python/target/4bdd14b8-92ba-43ba-a7fb-655e6769aeb9/python3__pyspark.sql.classic.column__i2_c1zct.log)
WARNING: Using incubator modules: jdk.incubator.vector
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
**********************************************************************
File "/Users/ruifeng.zheng/Dev/spark/python/pyspark/sql/column.py", line 385, in pyspark.sql.column.Column.contains
Failed example:
    df.filter(df.name.contains('o')).collect()
Differences (ndiff with -expected +actual):
    - [Row(age=5, name='Bobx')]
    ?                      -
    + [Row(age=5, name='Bob')]
**********************************************************************
   1 of   2 in pyspark.sql.column.Column.contains
***Test Failed*** 1 failures.

Had test failures in pyspark.sql.classic.column with python3; see logs.
(spark_dev_312) ➜  spark git:(master) ✗ python/run-tests -k --python-executables python3 --testnames 'pyspark.sql.connect.column'
Running PySpark tests. Output is in /Users/ruifeng.zheng/Dev/spark/python/unit-tests.log
Will test against the following Python executables: ['python3']
Will test the following Python tests: ['pyspark.sql.connect.column']
python3 python_implementation is CPython
python3 version is: Python 3.12.2
Starting test(python3): pyspark.sql.connect.column (temp output: /Users/ruifeng.zheng/Dev/spark/python/target/2acaff3c-ef1d-41eb-b63e-509f3e0192c0/python3__pyspark.sql.connect.column__66td62h9.log)
Finished test(python3): pyspark.sql.connect.column (3s)
Tests passed in 3 seconds
```

after this PR, it fails as expected:
```
(spark_dev_312) ➜  spark git:(master) ✗ python/run-tests -k --python-executables python3 --testnames 'pyspark.sql.connect.column'
Running PySpark tests. Output is in /Users/ruifeng.zheng/Dev/spark/python/unit-tests.log
Will test against the following Python executables: ['python3']
Will test the following Python tests: ['pyspark.sql.connect.column']
python3 python_implementation is CPython
python3 version is: Python 3.12.2
Starting test(python3): pyspark.sql.connect.column (temp output: /Users/ruifeng.zheng/Dev/spark/python/target/390ff7ae-7683-425c-b0d2-ee336e1ad452/python3__pyspark.sql.connect.column__f69b3smc.log)
WARNING: Using incubator modules: jdk.incubator.vector
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
org.apache.spark.SparkSQLException: [INVALID_CURSOR.DISCONNECTED] The cursor is invalid. The cursor has been disconnected by the server. SQLSTATE: HY109
	at org.apache.spark.sql.connect.execution.ExecuteGrpcResponseSender.execute(ExecuteGrpcResponseSender.scala:281)
	at org.apache.spark.sql.connect.execution.ExecuteGrpcResponseSender$$anon$1.run(ExecuteGrpcResponseSender.scala:101)
**********************************************************************
File "/Users/ruifeng.zheng/Dev/spark/python/pyspark/sql/column.py", line 385, in pyspark.sql.column.Column.contains
Failed example:
    df.filter(df.name.contains('o')).collect()
Expected:
    [Row(age=5, name='Bobx')]
Got:
    [Row(age=5, name='Bob')]
**********************************************************************
   1 of   2 in pyspark.sql.column.Column.contains
***Test Failed*** 1 failures.

Had test failures in pyspark.sql.connect.column with python3; see logs.
```

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

Closes #46895 from zhengruifeng/fix_connect_column_doc_test.

Authored-by: Ruifeng Zheng <ruifengz@apache.org>
Signed-off-by: Ruifeng Zheng <ruifengz@apache.org>

Author: zhengruifeng

python/pyspark/sql/connect/column.py

@@ -579,17 +579,17 @@ def _test() -> None:
     import sys
     import doctest
     from pyspark.sql import SparkSession as PySparkSession
-    import pyspark.sql.connect.column
+    import pyspark.sql.column
 
-    globs = pyspark.sql.connect.column.__dict__.copy()
+    globs = pyspark.sql.column.__dict__.copy()
     globs["spark"] = (
         PySparkSession.builder.appName("sql.connect.column tests")
         .remote(os.environ.get("SPARK_CONNECT_TESTING_REMOTE", "local[4]"))
         .getOrCreate()
     )
 
     (failure_count, test_count) = doctest.testmod(
-        pyspark.sql.connect.column,
+        pyspark.sql.column,
         globs=globs,
         optionflags=doctest.ELLIPSIS
         | doctest.NORMALIZE_WHITESPACE