drm/sched: Add test suite for concurrent job submissions

Add a new test suite to simulate concurrent job submissions to the DRM
scheduler, as this functionality is not covered by current test suites.

The new test suite includes two initial test cases: (i) a test case for
parallel job submission and (ii) a test case for interleaved job
submission and completion. In the first test case, worker threads
concurrently submit jobs to the scheduler, and then the timeline is
manually advanced to complete them in bulk. In the second test case,
worker threads concurrently submit sequences of jobs of different
durations to the mock scheduler using a sliding window to better model
real-world workloads. The timeline is advanced automatically by the
finishing jobs, interleaving submission with completion.

Signed-off-by: Marco Pagani <marco.pagani@linux.dev>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20260520093350.1036001-1-marco.pagani@linux.dev

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