cmd/tailscale/cli: prompt for y/n when attempting risky action

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Previously, when attempting a risky action, the CLI printed a 5 second countdown saying
"Continuing in 5 seconds...". When the countdown finished, the CLI aborted rather than
continuing.

To avoid confusion, but also avoid accidentally continuing if someone (or an automated
process) fails to manually abort within the countdown, we now explicitly prompt for a
y/n response on whether or not to continue.

Updates #15445

Co-authored-by: Kot C <kot@kot.pink>
Signed-off-by: Percy Wegmann <percy@tailscale.com>

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