Drive-by: include the right header in sandboxed-pointer-inl.h and fix
missing sandbox initialization in generate-bytecode-expectations.cc.

Bug: v8:10391
Change-Id: Ic39ba04b7c98eaa58ea3943189c23b297f581f5a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3630082Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Samuel Groß <saelo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81216}