[mlir][Vector] Remove `vector.extractelement` and `vector.insertelement` ops (#149603)
This PR removes `vector.extractelement` and `vector.insertelement` ops
from the code base in favor of the `vector.extract` and `vector.insert`
counterparts.
See RFC:
https://discourse.llvm.org/t/rfc-psa-remove-vector-extractelement-and-vector-insertelement-ops-in-favor-of-vector-extract-and-vector-insert-ops