feat(tailnet): add workspace updates support to Controller #15529
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re: #14730
Adds support in
tailnet.Controller
for WorkspaceUpdates.Also checks configured controllers against the clients returned by the dialer, so that if we connect with a dialer that doesn't support an RPC (for instance the in-memory dialer for ServerTailnet doesn't support WorkspaceUpdates), we throw an error if there is a controller expecting it.