SNOW-2005919: update tests to fix disabled sql simplifier workflow

[sfc-gh-lmukhopadhyay]

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

   Fixes SNOW-2005919

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

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

Update tests test_dataframe_groupby_transform_conflicting_labels and test_to_snowpark_pandas_duplicated_columns_raises to fix disabled sql simplifier workflow.
Passing workflow run: https://github.com/snowflakedb/snowpark-python/actions/runs/14072875832

[sfc-gh-snowflakedb-snyk-sa]

🎉 Snyk checks have passed. No issues have been found so far.

✅ security/snyk check is complete. No issues have been found. (View Details)

✅ license/snyk check is complete. No issues have been found. (View Details)

[sfc-gh-helmeleegy]

Thanks Labanya. Left one suggestion, but otherwise it looks good.