[Won't implement][Spike] Try out CleanThat

[jwlibby]

Won't implement Already built into Spotless.

Should this be part of #535 as configuration?

Try out CleanThat and see what you think.
When evaluating refer to the questions in #462 and upon completion add your pros and cons for this plugin as a comment to the aforementioned story.

Plugin link: CleanThat (and links to similar options in their README)

The GitHub repo for CleanThat recommends the Spotless maven plugin: https://github.com/solven-eu/cleanthat?tab=readme-ov-file#maven-free.
Let's not do this spike, and rely on Spotless (which we've already spiked).