Python: Add consistency check for PhaseDependentFlow
#15775
Merged
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This would have found the problem fixed in
#15755.
As highlighted in the comment in the code, it's not a perfect solution
since we don't have an automatic way to ensure we don't introduce a new
PhaseDependentFlow use with a new step relation and forget to add it to
this consistency check... but I think this consistency check still adds
value!