ci: partition bench codspeed job (#20332)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

.github/scripts/codspeed-build.sh

@@ -1,14 +0,0 @@
-#!/usr/bin/env bash
-set -eo pipefail
-
-# TODO: Benchmarks run WAY too slow due to excessive amount of iterations.
-
-cmd=(cargo codspeed build --profile profiling)
-crates=(
-    -p reth-primitives
-    -p reth-trie
-    -p reth-trie-common
-    -p reth-trie-sparse
-)
-
-"${cmd[@]}" --features test-utils "${crates[@]}"