[FR]: lint_test could produce useful XML

### What is the current behavior?

lint_test just asserts that the report was empty, but doesn't propagate the report elements into XML.

### Describe the feature

Looking at https://github.com/bazel-contrib/rules_jvm/pull/283/files it occurs to me that rules_lint with checkstyle would be a regression for a user who relies on the XML to report the issues into their CI user interface.

Start by reading lint_test and comparing the referenced rules_jvm pull request, focusing on how checkstyle report elements are handled. Determine the expected XML structure for CI consumers; done means lint_test preserves those report elements in useful XML rather than only asserting that the report is empty.

Written by the indexing model from the issue text.