Reduce in-source gradle files

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Issue details

Logging a reminder to revisit the need to check in build support files such as gradle wrapper jars into the repo.

When originally setting this up, working in a hurry I have found the following CI setup instructions that seem to indicate it is common practice to keep the Gradle wrapper JARs checked in. It might not be the only way to do things though.

https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-gradle

"The "Validate Gradle wrapper" step validates the checksums of Gradle Wrapper JAR files present in the source tree."

Affected area/feature

Start by locating the repository's Gradle wrapper JARs and related build or CI configuration. Check the Gradle wrapper validation guidance referenced in the issue, then determine whether the files can be removed while builds and CI continue to work; the issue does not name specific files or tests.