Patch-diff-report-tool: shorten file names is not doing anything

https://github.com/checkstyle/contribution/blob/master/patch-diff-report-tool/src/main/java/com/github/checkstyle/site/SiteGenerator.java#L219

Example:
https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/7e9dba3_2024170824/reports/diff/checkstyle/index.html#Violations

> /home/runner/work/checkstyle/checkstyle/.ci-temp/contribution/checkstyle-tester/repositories/checkstyle/src/test/resources/com/puppycrawl/tools/checkstyle/checks/coding/fallthrough/InputFallThrough4.java

Example from my launch script:
> src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/treewalker/InputTreeWalkerSkipParsingExceptionConfigSeverityIgnore.java

My launch scripts don't have this issue but I don't remember how it was resolved. It could be because they are running checkstyle directly and groovy is still calling the maven plugin.