igt/gem_exec_schedule: Exercise "deep" preemption

In investigating the issue with having to force preemption within the
executing ELSP[], we want to trigger preemption between all elements of
that array. To that end, we issue a series of requests with different
priorities to fill the in-flight ELSP[] and then demand preemption into
the middle of that series. One can think of even more complicated
reordering requirements of ELSP[], trying to switch between every
possible combination of permutations. Rather than check all 2 billion
combinations, be content with a few.

v2: Add a different pattern for queued requests. Not only do we need to
inject a request into the middle of a single context with a queue of
different priority contexts, but we also want a queue of different
contexts, as they have different patterns of ELSP[] behaviour.

v3: Fixup the naming clash from copy'n'pasting

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>

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