[CI] Add ep4_mtp e2e test (#6153)

* [CI] Add ep4_mtp e2e test

scripts/run_gpu_4cards.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+E2E_CASES_DIR="${REPO_ROOT}/tests/e2e/4cards_cases"
+FAILED_CASE_FILE="${REPO_ROOT}/failed_cases.txt"
+
+FAILED_COUNT=0
+
+rm -f "${FAILED_CASE_FILE}"
+
+shopt -s nullglob
+test_files=("${E2E_CASES_DIR}"/test_*.py)
+
+if [ "${#test_files[@]}" -eq 0 ]; then
+    echo "ERROR: No test files found under: ${E2E_CASES_DIR}"
+    exit 1
+fi
+
+for test_file in "${test_files[@]}"; do
+    echo "------------------------------------------------------------"
+    echo "Running pytest: ${test_file}"
+    echo "------------------------------------------------------------"
+
+    if ! python -m pytest -sv --tb=short "${test_file}"; then
+        echo "Pytest failed for: ${test_file}"
+        echo "${test_file}" >> "${FAILED_CASE_FILE}"
+        FAILED_COUNT=$((FAILED_COUNT + 1))
+
+        if [ -f "${REPO_ROOT}/log/log_0/workerlog.0" ]; then
+            echo "---------------- workerlog.0 (last 200 lines) -------------"
+            tail -n 200 "${REPO_ROOT}/log/log_0/workerlog.0"
+            echo "------------------------------------------------------------"
+        fi
+
+        if [ -f "${REPO_ROOT}/server.log" ]; then
+            echo "---------------- server.log (last 200 lines) ---------------"
+            tail -n 200 "${REPO_ROOT}/server.log"
+            echo "------------------------------------------------------------"
+        fi
+    fi
+done
+
+shopt -u nullglob
+
+if [ "${FAILED_COUNT}" -ne 0 ]; then
+    echo "${FAILED_COUNT} test file(s) failed:"
+    cat "${FAILED_CASE_FILE}"
+    exit 1
+else
+    echo "All 4-GPU end-to-end tests passed"
+    exit 0
+fi