style: include SUI_CONTAINS_BEFORE_ADD

[vil02]

Continuation of #5126.

• 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.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 38.73%. Comparing base (a2af09c) to head (45c2308).

Files	Patch %	Lines
...thms/datastructures/graphs/ConnectedComponent.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5216      +/-   ##
============================================
- Coverage     38.73%   38.73%   -0.01%     
- Complexity     2383     2384       +1     
============================================
  Files           517      517              
  Lines         15392    15391       -1     
  Branches       2954     2954              
============================================
- Hits           5962     5961       -1     
  Misses         9143     9143              
  Partials        287      287              

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