[LTP] thermal: add new test group

[linuxtestproject.agent@gmail.com]

Hi Piotr,

On Thu, 14 May 2026 15:34:47 +0200, Piotr Kubaj wrote:
> thermal: add new test group

> +	while (sleep_time > 0) {
> +		...
> +		if (temp > temp_high)
> +			break;
> +		sleep(sleep_time--);

G2: sleep() used for synchronization. This is not a timer API test so
the G2 exemption does not apply. Consider polling with
tst_timer_expired_ms() or discuss with maintainers if a thermal-specific
exception is appropriate.

> +			tst_res(TINFO, "Cooling down for %d seconds", COOLDOWN);
> +			sleep(COOLDOWN);

G2: Same issue — sleep() used as a synchronization barrier for CPU
cooldown between zone tests. If a non-sleep alternative is genuinely
infeasible for thermal testing, this needs explicit justification in the
commit message.

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