Allow ARRAY_FILTER_USE_VALUE as the mode of array_filter() and narrow its result

[Amoifr]

Closes phpstan/phpstan#15372

PHP 8.6 adds ARRAY_FILTER_USE_VALUE (0) as an explicit $mode for array_filter(). It is now part of the allowed constants for that parameter. The parameter takes a single value, so combining it with another mode is still reported as argument.bitmaskNotAllowed.

While testing it, I noticed the result was not narrowed with this mode: ArrayFilterFunctionReturnTypeHelper::determineMode() only recognised the values of ARRAY_FILTER_USE_KEY and ARRAY_FILTER_USE_BOTH, so ARRAY_FILTER_USE_VALUE (and a literal 0) gave array<int, int|null> where omitting the mode gives array<int, int>. A value of 0 now maps to the default mode.

The rule test runs with phpVersion: 80600. The type inference test needs the constant at runtime, so it is gated with // lint >= 8.6.