cli: add an environment variable to disable telemetry globally #1520
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With the current model described at https://devpod.sh/docs/other-topics/telemetry#telemetry-opt-out-process, a CLI user wanting to opt out of telemetry completely needs to remember to set the TELEMTRY option for every new context.
This PR adds an additional environment variable as a method to disable telemetry regardless of the current context. This is a common approach among open-sourced CLI programs.