rtla/tests: Add runtime test for -k and -u options

Add runtime test for rtla-timerlat's -k/--kernel-threads and
-u/--user-threads options using get_workload_pids.sh to check whether
the appropriate threads are being created.

The tests are implemented for both top and hist. Additionally, all tests
related to timerlat threads are moved to a separate section in the test
files. The latter is also done for rtla-osnoise tests.

Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260423130558.882022-9-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

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