Updating docker --build-arg test due to docker code change
Updating docker --build-arg test due to docker code change

Docker changed the error for a non-existent --build-arg to a warning
and changed the text of the message slightly, breaking one of our tests.
Docker change: https://github.com/moby/moby/commit/f150f42009dddb4f9b8d4ceef8763af701b0d0f9

Fixes: #16197

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