[CI] Enable auto upgrade e2e estimated time for auto-partition suites (#6840)

### What this PR does / why we need it?
This patch add a schedule triggered workflow for auto upgrade e2e
estimated-time for batter load balance
1. The workflow will run the full e2e test to get the duration of each
test.
2. The script `update_estimated_time.py` will upgrade the
[config.json](https://github.com/vllm-project/vllm-ascend/blob/main/.github/workflows/scripts/config.yaml)
according to the latest time
3. The workflow will submit a pull request that includes changes to
`config.json` automatically
<img width="2484" height="764" alt="image"
src="https://github.com/user-attachments/assets/02f3459c-bb3b-4f8e-9966-8bb2e5c1bbea"
/>


### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.15.0
- vLLM main:
83b47f67b1
- 
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.15.0
- vLLM main:
83b47f67b1

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

.github/workflows/schedule_update_estimated_time.yaml

@@ -0,0 +1,111 @@
+name: Update estimated test times
+
+on:
+  schedule:
+    - cron: '0 2 * * 1'  # Every Monday at 02:00 UTC
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - 'main'
+    paths:
+      - '.github/workflows/schedule_update_estimated_time.yaml'
+
+permissions:
+  contents: write
+  pull-requests: write
+
+concurrency:
+  group: update-estimated-times-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  e2e-test:
+    name: e2e-test
+    strategy:
+      matrix:
+        vllm_version: [15d76f74e2fdb12a95ea00f0ca283acf6219a2b7]
+        type: [full, light]
+    uses: ./.github/workflows/_e2e_test.yaml
+    with:
+      vllm: ${{ matrix.vllm_version }}
+      image: swr.cn-southwest-2.myhuaweicloud.com/base_image/ascend-ci/vllm-ascend:main
+      contains_310: false
+      type: ${{ matrix.type }}
+      continue_on_error: true  # Continue even if some tests fail, we want to collect as much timing data as possible
+
+  update-estimated-times:
+    name: Update estimated_time in config.yaml
+    needs: [e2e-test]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      - name: Download all timing artifacts
+        uses: actions/download-artifact@v4
+        with:
+          pattern: timing-data-*
+          path: timing-artifacts/
+          merge-multiple: false
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pyyaml
+
+      - name: Update config.yaml from timing data
+        run: |
+          python3 .github/workflows/scripts/update_estimated_time.py \
+            --timing-dir timing-artifacts/ \
+            --config .github/workflows/scripts/config.yaml
+
+      - name: Check for changes
+        id: check_changes
+        run: |
+          if git diff --quiet .github/workflows/scripts/config.yaml; then
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+            echo "No changes to config.yaml."
+          else
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+            echo "config.yaml has been updated:"
+            git diff .github/workflows/scripts/config.yaml
+          fi
+
+      - name: Create pull request
+        if: steps.check_changes.outputs.changed == 'true' && github.event_name != 'pull_request'
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          BRANCH="auto/update-estimated-times-${{ github.run_id }}"
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git checkout -b "$BRANCH"
+          git add .github/workflows/scripts/config.yaml
+          git commit -m "[CI] Auto-update estimated test times in config.yaml
+
+          Computed from timing-data artifacts of workflow run ${{ github.run_id }}.
+          Buffer ratio: 1.1x median, rounded to the nearest 10 s."
+          git push origin "$BRANCH"
+          gh pr create \
+            --repo "${{ github.repository }}" \
+            --base main \
+            --head "$BRANCH" \
+            --title "chore: Auto-update estimated test times in config.yaml" \
+            --body "## Summary
+
+          This PR was auto-generated by the **Update estimated test times** workflow.
+
+          It updates the \`estimated_time\` values in \`.github/workflows/scripts/config.yaml\`
+          based on actual elapsed times collected from workflow run \`${{ github.run_id }}\`.
+
+          ### Methodology
+          - Timing data is uploaded as \`timing-data-*\` artifacts by each e2e test job.
+          - For each test file, the **median** of all collected elapsed times is taken.
+          - A **10 % safety buffer** is applied and the result is rounded to the nearest 10 s.
+
+          Please review the diff and merge if the new values look reasonable."