SNOW-3034995: Add cloudpickle automatically when using artifact_repository with packages

[sfc-gh-aling]

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

   Fixes SNOW-3034995

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.

Problem
When using artifact_repository with custom packages, cloudpickle was not automatically added to the package list, causing ModuleNotFoundError: No module named 'cloudpickle' at runtime in UDF execution.
Root Cause
In src/snowflake/snowpark/_internal/udf_utils.py (lines 1232-1237), when both artifact_repository and packages were provided, the code directly assigned resolved_packages = packages without calling session._resolve_packages(), which meant cloudpickle was never added to the dependency list.
Solution
Added logic to automatically include cloudpickle when using artifact repositories with custom packages:

• Check for cloudpickle: After assigning the packages list, check if cloudpickle is already present using prefix match
• Auto-add if missing: If cloudpickle is not found, append cloudpickle=={version} to the package list
• Preserve user choice: If user already specified cloudpickle with any version constraint, respect it and don't duplicate

[sfc-gh-bkogan]

Thanks