rtla/tests: Check -c/--cpus thread affinity

RTLA runtime tests verify the -c/--cpus options, but do not check
whether the correct affinity is actually applied.

Add a script named check-cpus.sh that

rtla/tests: Check -c/--cpus thread affinity

RTLA runtime tests verify the -c/--cpus options, but do not check
whether the correct affinity is actually applied.

Add a script named check-cpus.sh that retrieves the affinity of all
workload threads and use it to check the -c/--cpus option for both
osnoise and timerlat tools.

Also add missing -c/--cpus test for osnoise.

Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260423130558.882022-4-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

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