[AArch64][SVE] Instcombine uzp1/reinterpret svbool to use vector.insert (#81069)

Concatenating two predictes using uzp1 after converting to double length
using sve.convert.to/from.svbool is optimized poorly in the backend,
resulting in additional `and` instructions to zero the lanes. See
https://github.com/llvm/llvm-project/pull/78623/

Combine this pattern to use `llvm.vector.insert` to concatenate and get
rid of convert to/from svbools.