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Migrate the workqueue_uaf test to the KUnit framework.

Initially, this test was intended to check that Generic KASAN prints
auxiliary stack traces for workqueues.  Nevertheless, the test is enabled
for all modes to make that KASAN reports bad accesses in the tested
scenario.

The presence of auxiliary stack traces for the Generic mode needs to be
inspected manually.

Link: https://lkml.kernel.org/r/1d81b6cc2a58985126283d1e0de8e663716dd930.1664298455.git.andreyknvl@google.com

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>