Record vLLM commit in PR description (#1623)

### What this PR does / why we need it?
This patch enables the vllm commits recording and also cleanup unused
commit msg note in PR.

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
- CI passed
- Test on https://github.com/Yikun/vllm-ascend/pull/33 and vllm commit
refreshed as expected.

Signed-off-by: Yikun Jiang <yikunkero@gmail.com>

.github/format_pr_body.sh

@@ -0,0 +1,52 @@
+#
+# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# This file is a part of the vllm-ascend project.
+#
+
+#!/bin/bash
+
+set -eux
+
+# ensure 2 argument is passed
+if [ "$#" -ne 3 ]; then
+    echo "Usage: $0 <pr_number> <vllm_version> <vllm_commit>"
+    exit 1
+fi
+
+PR_NUMBER=$1
+VLLM_VERSION=$2
+VLLM_COMMIT=$3
+OLD=/tmp/orig_pr_body.txt
+NEW=/tmp/new_pr_body.txt
+
+gh pr view --json body --template "{{.body}}" "${PR_NUMBER}" > "${OLD}"
+cp "${OLD}" "${NEW}"
+
+# Remove "FIX #xxxx (*link existing issues this PR will resolve*)"
+sed -i '/<!--/,/-->/d' "${NEW}"
+sed -i '/- vLLM .*$/d' "${NEW}"
+echo "- vLLM version: $VLLM_VERSION" >> "${NEW}"
+echo "- vLLM main: $VLLM_COMMIT" >> "${NEW}"
+
+# Run this only if ${NEW} is different than ${OLD}
+if ! cmp -s "${OLD}" "${NEW}"; then
+    echo
+    echo "Updating PR body:"
+    echo
+    cat "${NEW}"
+    gh pr edit --body-file "${NEW}" "${PR_NUMBER}"
+else
+    echo "No changes needed"
+fi