[InstCombine] `vector_reduce_mul(?ext(<n x i1>))` --> `zext(vector_reduce_and(<n x i1>))` (PR51259)

Alive2 agrees:
https://alive2.llvm.org/ce/z/PDansB (self)
https://alive2.llvm.org/ce/z/55D-Xc (zext)
https://alive2.llvm.org/ce/z/LxG3-r (sext)

We already handle `vector_reduce_and(<n x i1>)`,
so let's just combine into the already-handled pattern
and let the existing fold do the rest.