test(object/mergeWith): add test cases for replacing non-plain-object with plain object

[sukvvon]

AS-IS

TO-BE

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Project	Deployment	Preview	Comments	Updated (UTC)
es-toolkit	Ready	Preview	Comment	Oct 24, 2025 3:43pm

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.93%. Comparing base (2687388) to head (1cb2619).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1500      +/-   ##
==========================================
+ Coverage   99.88%   99.93%   +0.04%     
==========================================
  Files         468      468              
  Lines        4453     4453              
  Branches     1311     1311              
==========================================
+ Hits         4448     4450       +2     
+ Misses          5        3       -2     

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