fix: fix tailnet remoteCoordination to wait for server #14666
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Fixes #12560
When gracefully disconnecting from the coordinator, we would send the Disconnect message and then close the dRPC stream. However, closing the dRPC stream can cause the server not to process the Disconnect message, since we use the stream context in a
selectwhile sending it to the coordinator.This is a product bug uncovered by the flake, and probably results in us failing graceful disconnect some minority of the time.
Instead, the
remoteCoordination(andinMemoryCoordinationfor consistency) should send the Disconnect message and then wait for the coordinator to hang up (on some graceful disconnect timer, in the form of a context).