NO-SNOW: Apply test session parameters to doctest sessions

[sfc-gh-bkogan]

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

   NO-SNOW

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.

   The session fixture in src/conftest.py (used for running doctests) creates a Session directly and never calls set_up_test_session_parameters, so settings like ENABLE_PYTHON_3_14, ENABLE_DEFAULT_PYTHON_ARTIFACT_REPOSITORY, ENABLE_EXTRACTION_PUSHDOWN_EXTERNAL_PARQUET_FOR_COPY_PHASE_I, and ENABLE_ROW_ACCESS_POLICY are not applied to doctests. This PR imports set_up_test_session_parameters from tests/integ/session_parameters.py (the existing sys.path.append("tests/") already makes this importable) and calls it after the doctest session is created so doctests run with the same session configuration as integration tests. The helper already short-circuits when local_testing_mode is true, so no additional guarding is needed.

[sfc-gh-bkogan]

passed here:
https://github.com/snowflakedb/snowpark-python/actions/runs/25340402193/job/74296538038?pr=4209

wont add to PR gate

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.18%. Comparing base (e56041f) to head (5e1370b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4209      +/-   ##
==========================================
- Coverage   95.42%   95.18%   -0.25%     
==========================================
  Files         171      171              
  Lines       43835    43835              
  Branches     7513     7513              
==========================================
- Hits        41829    41723     -106     
- Misses       1226     1292      +66     
- Partials      780      820      +40     

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