drm/xe: skip error capture when exec queue is killed

When user closes exec queue soon after job submission,
we are generating error coredump. Instead check if
exec queue is killed during job timeout then skip
error coredump capture.

V2:
  - Just skip error capture - MattB

Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240430131229.2228809-1-tejas.upadhyay@intel.com