Add TypeCombinator::removeFalsey()
#2003
Merged
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This PR adds the ability for the type combinator to remove falsey types from a given type. I am in need of this functionality within an extension, but the static type factory is currently not part of the public API. Rather than changing that, this seemed like a better way to expose the functionality.
PHPStan also contains a few places where it removes falsey types, so I replaced those occurrences.