SNOW-3485471: fix aliased dataframe referencing wrong column

[sfc-gh-aling]

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

Fixed a bug where calling DataFrame.alias() twice on the same DataFrame (e.g. for a self-join) caused both aliases to share the same internal column-mapping dictionary. This made col("R", "col") resolve to the same column as col("L", "col"), producing incorrect join conditions and filter expressions.

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   • I am adding a new automated test(s) to verify correctness of my new code
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   • If this is a new feature/behavior, I'm adding the Local Testing parity changes.
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3. Please describe how your code solves the related issue.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.39%. Comparing base (cf1407f) to head (2e22850).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4246   +/-   ##
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  Coverage   95.39%   95.39%           
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  Files         171      171           
  Lines       44241    44241           
  Branches     7556     7556           
=======================================
  Hits        42204    42204           
  Misses       1250     1250           
  Partials      787      787           

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