Added all NearestElementTest methods and test file

[Sahilagarwal623]

Description

Added System.out.println() statements to all methods in NearestElementTest.java so that test outputs can be seen in the console when running mvn test. Existing functionality is preserved and all assertions continue to pass.

Checklist

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations. (Not applicable for test modifications)
• All new code is formatted with clang-format -i --style=file path/to/your/file.java. (Not applicable for test modifications)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.80%. Comparing base (e6cb96f) to head (3daf78e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6659      +/-   ##
============================================
+ Coverage     75.74%   75.80%   +0.05%     
- Complexity     5771     5793      +22     
============================================
  Files           702      704       +2     
  Lines         19770    19815      +45     
  Branches       3832     3844      +12     
============================================
+ Hits          14975    15020      +45     
  Misses         4215     4215              
  Partials        580      580              

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[DenizAltunkapan]

@Sahilagarwal623 Please fix the failing workflows so I can start the review.