[LTP] thermal: add new test group

[linuxtestproject.agent@gmail.com]

Hi Piotr,

On 2026-05-14, Piotr Kubaj wrote:
> thermal: add new test group

> +static void run(void)
> +{
> +	static bool first_zone = true;
> +	...
> +		if (!first_zone) {
> +			tst_res(TINFO, "Cooling down for %d seconds", COOLDOWN);
> +			sleep(COOLDOWN);
> +		}
> +		first_zone = false;

The `static` qualifier means `first_zone` is initialized only once, at
program start. On the second iteration (`-i 2`), it will already be
`false`, causing the first zone to incur an unnecessary 300-second
cooldown. Drop `static` so it resets to `true` on every call.

[...]

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