gerrit: Use asyncssh
Replace shelling out to ssh with an asyncssh powered polling loop.
This change enables the gerrit task to detect connectivity issues caused
by interruption of the TCP stream from the gerrit server.
Bug: T359096
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Replace shelling out to ssh with an asyncssh powered polling loop.
This change enables the gerrit task to detect connectivity issues caused
by interruption of the TCP stream from the gerrit server.
Bug: T359096