cmd/tailscale/cli: start WatchIPNBus before initial Start

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This partially reverts f3d2fd2.

When that patch was written, the goroutine that responds to IPN notifications
could call `StartLoginInteractive`, creating a race condition that led to
flaky integration tests. We no longer call `StartLoginInteractive` in that
goroutine, so the race is now impossible.

Moving the `WatchIPNBus` call earlier ensures the CLI gets all necessary
IPN notifications, preventing a reauth from hanging.

Updates tailscale/corp#31476

Signed-off-by: Alex Chan <alexc@tailscale.com>

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