Fix contains_direct_eval for ordinary function

[hpp2334]

This Pull Request fixes #4401.

The issue occurred because the binding was incorrectly classified as local, making it inaccessible during eval execution.

It changes the following:

• for ordinary function, the contains_direct_eval apply to the entire subtree rather than just the node itself.

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 51.57%. Comparing base (6ddc2b4) to head (c35a52f).
⚠️ Report is 546 commits behind head on main.

Files with missing lines	Patch %	Lines
core/ast/src/operations/mod.rs	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4453      +/-   ##
==========================================
+ Coverage   47.24%   51.57%   +4.33%     
==========================================
  Files         476      504      +28     
  Lines       46892    51382    +4490     
==========================================
+ Hits        22154    26502    +4348     
- Misses      24738    24880     +142     

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[HalidOdat]

Nice work! @hpp2334 😄