Expand shellcheck enforcement to the entire tools/run_tests

tools/run_tests/sanity/check_shellcheck.sh

@@ -19,10 +19,7 @@ set -e
 ROOT="$(dirname "$0")/../../.."
 
 DIRS=(
-    'tools/run_tests/artifacts'
-    'tools/run_tests/dockerize'
-    'tools/run_tests/helper_scripts'
-    'tools/run_tests/sanity'
+    'tools/run_tests'
 )
 
 for dir in "${DIRS[@]}"; do