Remove test-includes build

This is making the CI red. I believe this is because we do a clean build
w/o metamode in the tinderbox, so none of the artifacts needed to build
a binary are present. However, I've not recreated the problem locally
yet to confirm. Remove this while I investigate. This partially reverts
dd55767b86bc. The rest of the commit causes no harm w/o the explicit
test here.

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