Add new utility script and update test tags

- Added new utility script run_tests_all_cfgs.sh to run tests for all configurations and with test tag support.
- Updated run_tests.sh to add the new test tag for NVS unit tests.

scripts/run_tests_all_cfgs.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+set -e
+
+# Check tag argument
+arg_tag=$1
+if [[ -z "$arg_tag" ]]; then
+    arg_tag="all"
+fi
+
+# Resolve Paths and Switch to Working Directory
+script_dir=$(dirname "$(readlink -f "$0")")
+project_root=$(dirname "$script_dir")
+
+echo "Script dir: ${script_dir}"
+echo "Project root: ${project_root}"
+
+echo "🔍 Searching for 'test_apps' directory in '$project_root'..."
+test_apps_dir=$(find "$project_root" -type d -name "test_apps" | head -n 1)
+echo "test_apps dir: ${test_apps_dir}"
+
+# Execute tests for all configs
+mapfile -t sdkcfg_files < <(find "$test_apps_dir" -maxdepth 1 -type f -name "sdkconfig.defaults*")
+
+for sdkcfg_file in "${sdkcfg_files[@]}"; do
+    echo "🔧 Running tests with config: $sdkcfg_file"
+    "${script_dir}"/run_tests.sh -c -f "$sdkcfg_file" -t "$arg_tag" || {
+        echo "❌ Tests failed with config: $sdkcfg_file"
+        exit 1
+    }
+done