[MISC] Use the NO CHANGELOG label to optimize the changelog detection logic in CI.

[jieguangzhou]

Currently, we have implemented changelog checks for all PRs, but this can be inconvenient for PRs involving minor changes that don't require a changelog update. Therefore, we could introduce a GitHub label to indicate whether a PR can skip the changelog CI checks.

jobs:
  # ---------------------------------
  # Unit Testing
  # ---------------------------------
  unit-testing:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [ "ubuntu-latest" ]
        python-version: ["3.10", "3.11"]
    steps:
    - name: Checkout repository
      uses: actions/checkout@v4

    - name: Get PR Labels
      id: labels
      uses: actions/github-script@v6
      with:
        github-token: ${{secrets.GITHUB_TOKEN}}
        script: |
          const { data: pullRequest } = await github.rest.pulls.get({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: context.issue.number
          });
          return pullRequest.labels.map(label => label.name);

    - name: Validate Changelog Update
      if: "!contains(steps.labels.outputs.result, 'no changelog')"
      uses: tarides/changelog-check-action@v2
      with:
        changelog: CHANGELOG.md

[jieguangzhou]

#2034 (comment)