Check that try-runtime compiles in CI (#4736)

It also moves some simple scripts directly into the .gitlab.yaml file.

polkadot/scripts/gitlab/check_no_default_features.sh

@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-
-set -e
-
-pushd node/service && cargo check --no-default-features && popd
-pushd cli && cargo check --no-default-features --features "service" && popd

polkadot/scripts/gitlab/check_runtime_benchmarks.sh

@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-
-#shellcheck source=../common/lib.sh
-source "$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )/../common/lib.sh"
-
-time cargo check --features runtime-benchmarks