rtla/tests: Add unit test for cpu_list_iterate()

cpu_list_iterate() was split out of parse_cpu_set() to hold shared code
between it and the newly added function get_possible_cpus().

As its semantics are more complex than parse_cpu_set() - it calls a
callback on each element of the list, with possible abort on failure,
while parse_cpu_set() cares only about the set defined by the list - it
deserves its own test.

Test the callback being called correctly as well as the return value and
early break on different combinations of comma-separated numbers and
ranges.

Link: https://lore.kernel.org/r/20260814135511.2207190-5-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

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