Move scripts used in CI to the new location (#5198)

* Move CI scripts and update references

* Update paths in .gitlab-ci.yml

* Removed outdated entries from CODEOWNERS

polkadot/scripts/ci/run_benches_for_runtime.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+set -e
+
+# Runs all benchmarks for all pallets, for a given runtime, provided by $1
+# Should be run on a reference machine to gain accurate benchmarks
+# current reference machine: https://github.com/paritytech/substrate/pull/5848
+
+runtime="$1"
+
+echo "[+] Running all benchmarks for $runtime"
+
+cargo +nightly build --profile production --locked --features=runtime-benchmarks
+
+./target/production/polkadot benchmark pallet \
+    --chain "${runtime}-dev" \
+    --list |\
+  tail -n+2 |\
+  cut -d',' -f1 |\
+  uniq > "${runtime}_pallets"
+
+# For each pallet found in the previous command, run benches on each function
+while read -r line; do
+  pallet="$(echo "$line" | cut -d' ' -f1)";
+  echo "Runtime: $runtime. Pallet: $pallet";
+  # '!' has the side effect of bypassing errexit / set -e
+  ! ./target/production/polkadot benchmark pallet \
+    --chain="${runtime}-dev" \
+    --steps=50 \
+    --repeat=20 \
+    --pallet="$pallet" \
+    --extrinsic="*" \
+    --execution=wasm \
+    --wasm-execution=compiled \
+    --heap-pages=4096 \
+    --header=./file_header.txt \
+    --output="./runtime/${runtime}/src/weights/${pallet/::/_}.rs"
+done < "${runtime}_pallets"
+rm "${runtime}_pallets"
+
+# Benchmark base weights
+! ./target/production/polkadot benchmark overhead \
+  --chain="${runtime}-dev" \
+  --execution=wasm \
+  --wasm-execution=compiled \
+  --weight-path="runtime/${runtime}/constants/src/weights/" \
+  --warmup=10 \
+  --repeat=100
+
+
+# This true makes sure that $? is 0 instead of
+# carrying over a failure which would otherwise cause
+# the whole CI job to abort.
+true