PMD upgrade to 7.x

[DaanHoogland]

Pull request overview

Bumps the Maven PMD plugin version used by the build from 3.12.0 to 3.28.0.

Changes:

• Update cs.pmd-plugin.version property to 3.28.0.

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Originally posted by @Copilot in #12543 (review)

[vishesh92]

We will need to update PMD's config to be compatible with the new version
#13168