5476: Add renameSnapshotArtifacts to glean-gradle-plugin r=mdboom a=mdboom

This is an attempt to fix the issue in #5464, just by copying the `renameSnapshotArtifacts` task to `glean-gradle-plugin`'s build. 

I'm not sure how to test this locally or prior to merging, though...


Co-authored-by: Michael Droettboom <mdboom@gmail.com>
Co-authored-by: Johan Lorenzo <jlorenzo@mozilla.com>