cmd/tailscale/cli,clientupdate: extract new clientupdate package #8827
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Extract the self-update logic from cmd/tailscale/cli into a standalone package that could be used from tailscaled later.
The update setup code was refactored a bit compared to original.
The actual
updater.update*
methods are largely the same, with some extra validation and calls tolog.Print*
/fmt.Print*
replaced with the pluggable logger.Updates #6995