NO-SNOW: fix type check before AST in sort()

[sfc-gh-mayliu]

1. Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SNOW-NNNNNNN

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
     • If this test skips Local Testing mode, I'm requesting review from @snowflakedb/local-testing
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am adding new credentials
   • I am adding a new dependency
   • If this is a new feature/behavior, I'm adding the Local Testing parity changes.
   • I acknowledge that I have ensured my changes to be thread-safe. Follow the link for more information: Thread-safe Developer Guidelines
   • If adding any arguments to public Snowpark APIs or creating new public Snowpark APIs, I acknowledge that I have ensured my changes include AST support. Follow the link for more information: AST Support Guidelines

3. Please describe how your code solves the related issue.

   Please write a short description of how your code change solves the related issue.

Impacted AST test job: https://github.com/snowflakedb/snowpark-python/actions/runs/18924709047/job/54029335118?pr=3971

[gw1] linux -- Python 3.13.7 /home/runner/work/snowpark-python/snowpark-python/.tox/py313-notudfdoctest-ci/bin/python3
tests/integ/test_df_sort.py:71: in test_sort_invalid_inputs
    assert (
E   assert 'sort() only accepts str and Column objects, or a list containing str and Column objects' in '<ExceptionInfo TypeError("<class \'list\'> is not a valid type for Column or column name AST.") tblen=5>'
E    +  where '<ExceptionInfo TypeError("<class \'list\'> is not a valid type for Column or column name AST.") tblen=5>' = str(<ExceptionInfo TypeError("<class 'list'> is not a valid type for Column or column name AST.") tblen=5>)

Root cause is that type checking for sort(...*cols) occurs later than AST expr parsing and thus impacts AST before TypeError is thrown.