Added an output called ``applied` so you can get the added label

Usage:

    - name: PR Labeler
      id: pr-label
      uses: WalshyDev/pr-labels@feature/label-output
      with:
        token: "${{ secrets.GITHUB_TOKEN }}"
        fix: 'Fix'
        feature: 'Feature'
        perf: 'Performance Improvement'

    - name: Print the label
      run: echo "The label ${{ steps.pr-label.outputs.applied }} was applied"