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Do not profile wrapper function of starpu_execute_on_{each,specific_workers}

Philippe SWARTVAGHER requested to merge pswartva/starpu:do-not-profile-execute-each into master

When one calls starpu_execute_on_each_worker or starpu_execute_specific_workers, it will create tasks which are starpu_task_submit-ed. When these tasks are getting executed, the driver that will call wrapper_func has already profiling probes before and after to tell the start and stop of task execution. Thus, having the same probes also in wrapper_func is useless (and confusing).

A kind of call stack can be visualized like the following:

start_job_on_{cuda,hip,...}
  probe start
  wrapper func
    probe start
    func
    probe end
  probe end

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