more precise preg_replace_callback* $flags types

### Bug report

$flags only supports `int-mask<0|[PREG_UNMATCHED_AS_NULL|PREG_OFFSET_CAPTURE>`.

given other values, it should error 

### Code snippet that reproduces the problem

https://phpstan.org/r/140e3281-fece-4420-a679-4db73333492c

### Expected output

4 error regarding invalid $flags arg

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