Rollup merge of #134680 - lqd:run-make-cleanup, r=jieyouxu

Clean up a few rmake tests

Now I'm aware it's a bit late to start participating in the Advent of Tests, but here are a few cleanups in the rmake tests to put under the 🎄 anyways. A handful of unused imports, some warnings, and a couple typos.

r? `@jieyouxu` 🎅

Author: matthiaskrgr