Added test to ensure array push is immutable

[guptaarnav]

Adding test requested by @jtran in #4232 (comment)

Ensures that when an element is pushed to an array, that element is not available on the original array.

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Name	Status	Preview	Updated (UTC)
modeling-app	✅ Ready (Inspect)	Visit Preview	Oct 30, 2024 10:20pm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.07%. Comparing base (0d52851) to head (9620c98).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4361      +/-   ##
==========================================
+ Coverage   85.86%   86.07%   +0.21%     
==========================================
  Files          77       78       +1     
  Lines       27434    27621     +187     
==========================================
+ Hits        23557    23776     +219     
+ Misses       3877     3845      -32     

Flag	Coverage Δ
wasm-lib	86.07% <ø> (+0.21%)	⬆️

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[jtran]

Thank you!