[4.6] Handle xfail(strict=True) properly in --step-wise mode (#5555)

[nicoddemus]

No description provided.

[codecov]

Codecov Report

Merging #5556 into 4.6-maintenance will increase coverage by 0.26%.
The diff coverage is 100%.

@@                 Coverage Diff                 @@
##           4.6-maintenance    #5556      +/-   ##
===================================================
+ Coverage            95.92%   96.19%   +0.26%     
===================================================
  Files                  115      115              
  Lines                26447    26461      +14     
  Branches              2610     2611       +1     
===================================================
+ Hits                 25369    25453      +84     
+ Misses                 755      703      -52     
+ Partials               323      305      -18

Impacted Files	Coverage Δ
src/_pytest/stepwise.py	96.55% <100%> (ø)	⬆️
testing/test_stepwise.py	100% <100%> (ø)	⬆️
src/_pytest/fixtures.py	97.55% <0%> (+0.27%)	⬆️
testing/test_capture.py	99.25% <0%> (+0.29%)	⬆️
testing/test_terminal.py	99.84% <0%> (+0.31%)	⬆️
testing/test_config.py	99.83% <0%> (+0.33%)	⬆️
testing/test_pdb.py	99.22% <0%> (+0.38%)	⬆️
src/_pytest/pytester.py	91.66% <0%> (+0.42%)	⬆️
src/_pytest/assertion/rewrite.py	95.77% <0%> (+0.48%)	⬆️
testing/python/fixtures.py	99.09% <0%> (+0.56%)	⬆️
... and 11 more

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