Engine should re-raise the original exception

ewoks execute demo --test -p a=wrong

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/task.py", line 401, in execute
    self.run()
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/tests/examples/tasks/sumtask.py", line 14, in run
    result += self.inputs.b
TypeError: can only concatenate str (not "int") to str

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/events/contexts.py", line 88, in _context
    yield execinfo
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/events/contexts.py", line 54, in job_context
    yield execinfo
  File "/usr/local/lib/python3.8/dist-packages/ewoks/bindings.py", line 78, in execute_graph
    result = mod.execute_graph(graph, execinfo=execinfo, **execute_options)
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/events/contexts.py", line 25, in wrapper
    return method(*args, execinfo=execinfo, **kw)
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/bindings.py", line 56, in execute_graph
    return sequential.execute_graph(taskgraph.graph, **execute_options)
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/graph/execute/sequential.py", line 122, in execute_graph
    task.execute(
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/task.py", line 407, in execute
    raise RuntimeError(f"Task '{self.label}' failed") from e
RuntimeError: Task 'ewokscore.tests.examples.tasks.sumtask.SumTask' failed

ewoks execute demo --test -p a=wrong --engine=ppf

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/events/contexts.py", line 88, in _context
    yield execinfo
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/events/contexts.py", line 54, in job_context
    yield execinfo
  File "/usr/local/lib/python3.8/dist-packages/ewoks/bindings.py", line 78, in execute_graph
    result = mod.execute_graph(graph, execinfo=execinfo, **execute_options)
  File "/usr/local/lib/python3.8/dist-packages/ewokscore/events/contexts.py", line 25, in wrapper
    return method(*args, execinfo=execinfo, **kw)
  File "/usr/local/lib/python3.8/dist-packages/ewoksppf/bindings.py", line 600, in execute_graph
    return ppfgraph.run(**execute_options)
  File "/usr/local/lib/python3.8/dist-packages/ewoksppf/bindings.py", line 569, in run
    raise RuntimeError(ex["errorMessage"])
RuntimeError: Task 'ewokscore.tests.examples.tasks.sumtask.SumTask' failed