fix: schema evolution for merge operation

[JustinRush80]

Description

Fix Schema Evolution in MERGE operation when there are chained expression such as
when_not_matched_insert_all().when_matched_update_all().execute()

Related Issue(s)

• closes [Bug]: Table merging fails with merge_schema=True #3943

Documentation

[github-actions]

ACTION NEEDED

delta-rs follows the Conventional Commits specification for release automation.

The PR title and description are used as the merge commit message. Please update your PR title and description to match the specification.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.22%. Comparing base (26e2b42) to head (bb8fb73).

Files with missing lines	Patch %	Lines
crates/core/src/operations/merge/mod.rs	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3945      +/-   ##
==========================================
- Coverage   26.22%   26.22%   -0.01%     
==========================================
  Files         124      124              
  Lines       19886    19884       -2     
  Branches    19886    19884       -2     
==========================================
- Hits         5216     5214       -2     
  Misses      14300    14300              
  Partials      370      370              

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[ion-elgreco]

Thanks @JustinRush80 :)