Console: Update doco to point to `sdkconfig.local`, and handle no-stats cases.

When `CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS` is not set, the FreeRTOS
scheduler will not keep track of task runtime statistics, and the `tasks`
command on the console will show `nan%` for the usage.

This adds a recommendation for the user to enable the `...STATS` config in
their build, and also updates the guidance for `configUSE_TRACE_FACILITY`
to point at the supported `sdkconfig.local` configuration pathway, instead
of pointing at the `#define` that's deeper in the configuration stack.

Also, the sampling period is dropped from 2.5s to 10ms when the runtime
stats are not enabled; given that we're not measuring any usage, it's not worth
sleeping any longer than that. We might even be able to drop to zero?

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