Keep NeverType isExplicit-flag in TypeCombinator::intersect() #2112
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inspired by #2110 where we addd logic based on NeverType explicitness, I figured it would be helpful if the TypeCombinator would keep the exlicitness, instead of create a new non-explicit NeverType every-time it combines NeverTypes'.
Before this PR there was no way to differentiate between NeverType explicit and implicit - I therefore added the same "hack" we use to differentiate explicit and implicit MixedType in tests.
this could be followed up by changes in e.g.
phpstan-src/src/Reflection/InitializerExprTypeResolver.php
Lines 500 to 502 in b76e7b1
InitializerExprTypeResolver
with this pattern)