Fix telemetry consent prompt

[alcuadrado]

This PR implements three changes to the telemetry consent prompt:

1. It doesn't show it if not running in an interactive terminal. When running hardhat from a script, it defaults to not reporting anything.
2. It adds a timeout to the prompt. If we don't get an answer in a short period of time, we don't report anything, nor store any consent value.
3. Don't enable the error reporting unless we have explicit consent from the user.