Shut down help proxy when help comm drops#1285
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Branched from #1284
While working on that PR I noticed that we never shut down the proxy server when the Help comm is tore down. If we start a new one, we'd pile up a new proxy.
This is theoretical because Help is one of the comms that the frontend reuses on refresh/reload (unlike the UI comm). But it still seems nice to handle the shutdown path properly. Covered by a new test.