[PMD] Additional Static Mutator UselessQualifiedThis

[blacelle]

If existing, a reference to the rule from the external system :

• UselessQualifiedThis

Please also provide code examples before -> after.

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You want also want to implement a mutator by your self:

• Consider eu.solven.cleanthat.engine.java.refactorer.mutators.EmptyControlStatement as an example
• Add tests in eu.solven.cleanthat.engine.java.refactorer.cases.do_not_format_me.EmptyControlStatementCases
• Wire tests through eu.solven.cleanthat.engine.java.refactorer.cases.TestEmptyControlStatementCases
• Open a PR from a personal fork, allowing maintainers to edit your PR.
• Thanks!