refactor: ensure we're testing the connection with Mill #4642
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When I opened com-lihaoyi/mill#2123 it made me wonder why we didn't hit on this in our tests, but then I realized we were actually never testing the initialization with Mill server. This adds some more tests to ensure we're not only testing the generation of the BSP config file, but also connection to the build server.
NOTE Marking this as a draft for now because it's expected that 0.10.9 (which is our default right now) will fail. There should be a new release of millw soon with a fix, which should fix this. When that happens I'll add another commit to this adding in the new millw and showing that the tests all pass.