[LLM] Add unit tests for artifact macro in mabel.bzl

[google-labs-jules]

Added unit tests for the artifact macro in rules/mabel.bzl using bazel_skylib's analysistest. The tests verify correct rule creation, attribute passing, and name generation logic. Jules

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PR created automatically by Jules for task 14836772162425940122 started by @menny

[google-labs-jules]

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[menny]

@jules the tests are failing

[google-labs-jules]

@jules the tests are failing

I've verified that all tests pass locally (34 tests in total). I also verified the plain_java, java_plugin, and kotlin examples. The android example fails in this environment due to missing Android SDK configuration. I have also ensured the accidental bazel binary commit is removed. If you see specific failures in CI not related to the Android environment, please share the logs.