[fix] remove unused scripts

The run.sh script for benchmarks is not necessary anymore, and the
release.sh script is not used for releases either.
8 jobs for shellcheck in 6 minutes and 49 seconds (queued for 19 seconds)
Status Job ID Name Coverage
  Style
passed #73763
nix kvm
clang-format

00:00:05

passed #73762
nix kvm
repoquality

00:00:02

passed #73764
nix kvm
style:docs

00:00:44

 
  Build
passed #73769
cuda
make:chimera

00:00:54

passed #73765
nix kvm
make:generic

00:01:11

passed #73768
knl
make:knl

00:04:02

passed #73766
nix kvm
make:out-of-tree

00:01:11

passed #73767
nix kvm
make:valgrind

00:01:53