[prone] Add UnusedMethod

[Pankraz76]

Description

[Describe what this change achieves]

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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related to:

• [rewrite] Add GradleBestPractices #19885
• Remove unused "private" methods #19187
• Remove unused private methods apache/maven#11165
• Remove unused private methods apache/maven#2310
• [prone] Add UnusedVariable apache/maven-parent#508
• [prone] Apply UnusedMethod gradle/gradle#35470

[github-actions]

❌ Gradle check result for 12d0e3b: FAILURE

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[github-actions]

❌ Gradle check result for 1390952: FAILURE

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[github-actions]

❌ Gradle check result for b3bedc7: FAILURE

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[github-actions]

❌ Gradle check result for 6b342aa: FAILURE

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[github-actions]

❌ Gradle check result for 15cf8b1: null

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[github-actions]

❕ Gradle check result for 8716f0e: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.29%. Comparing base (9ff84a8) to head (8716f0e).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #19896      +/-   ##
============================================
+ Coverage     73.20%   73.29%   +0.08%     
- Complexity    71306    71370      +64     
============================================
  Files          5770     5770              
  Lines        325687   325656      -31     
  Branches      47154    47152       -2     
============================================
+ Hits         238425   238683     +258     
+ Misses        68187    67909     -278     
+ Partials      19075    19064      -11     

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