hide pytest-bdd internal method in user tracebacks

[glehmann]

hide pytest-bdd internal method in user tracebacks.

It makes a much tidier output, a bit like when not using pytest-bdd:

__________________________________________________________________ test_authenticated_access_to_the_application ___________________________________________________________________
.venv/lib/python3.10/site-packages/pytest_bdd/scenario.py:184: in scenario_wrapper
    _execute_scenario(feature, scenario, request)
.venv/lib/python3.10/site-packages/pytest_bdd/scenario.py:154: in _execute_scenario
    _execute_step_function(request, scenario, step, step_func)
.venv/lib/python3.10/site-packages/pytest_bdd/scenario.py:124: in _execute_step_function
    return_value = call_fixture_func(fixturefunc=step_func, request=request, kwargs=kwargs)
.venv/lib/python3.10/site-packages/_pytest/fixtures.py:891: in call_fixture_func
    fixture_result = fixturefunc(**kwargs)
tests/gui/step_defs/star_steps.py:36: in redirected_to_homepage
    assert False
E   AssertionError

becomes just:

__________________________________________________________________ test_authenticated_access_to_the_application ___________________________________________________________________
tests/gui/step_defs/star_steps.py:36: in redirected_to_homepage
    assert False
E   AssertionError

I tried to hide only the methods that I've actually seen in my errors, but a more complete approach may be chosen.

fixes #555

[codecov]

Codecov Report

Merging #557 (64e2086) into master (f686505) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #557   +/-   ##
=======================================
  Coverage   98.49%   98.49%           
=======================================
  Files          32       32           
  Lines         733      733           
  Branches       18       18           
=======================================
  Hits          722      722           
  Misses          9        9           
  Partials        2        2           

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