Rename "autopush" prefix metrics -> "autoconnect"

[data-sync-user]

With the now formal rename of the connection server from “autopush” to “autoconnect”, for clarity we should rename its metrics' historical “autopush” prefix to “autoconnect”.

Once deployed we can duplicate our Grafana dashboard and modify it to refer to the new names while continuing to use the old dashboard when needed to look at historical data until it expires (I believe in 6 months).

This is a very low priority task and more of a nice to have than anything else.

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