style: remove redundant PMD exclusions

[vil02]

Some of the exclusions become unnecessary.

Continuation of #5155.

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 73.77%. Comparing base (a5a4873) to head (5ba2603).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6209   +/-   ##
=========================================
  Coverage     73.77%   73.77%           
  Complexity     5297     5297           
=========================================
  Files           670      670           
  Lines         18343    18343           
  Branches       3546     3546           
=========================================
  Hits          13533    13533           
  Misses         4263     4263           
  Partials        547      547           

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