Add a warning for available CLI updates #1749
                
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Use
@oclif/plugin-warn-if-update-availableto display a message to the user in case the CLI can be updated.@alex-pakalniskis Lots of options for update checking frequency and user notification frequency.
Mainly what we might want to discuss:
timeoutInDays: duration between update checks. Defaults to 60.frequency: the frequency that the new version warning should be shown (on every command execution by default).Closes #978
We might want to also signal how to upgrade in the message. For now it could be a link to the release section of the repo or to documentation showing how to upgrade the CLI. Later on we could have a
graph updatecommand like #1318 is suggesting.