Add synopsys detect exit codes and exit code names as detect-action o…

[uluzox]

…utput.

As a developer, I want to react upon different outcomes of the detect scan.
By use of the exit codes, I can (or avoid to) run further actions after the detect scan finished.

Example

- name: 🦆 Run Detect Scan
   id: scan
   uses: synopsys-sig/detect-action@v0.3.3
   env:
     DETECT_PROJECT_VERSION_NAME: 'master'
     DETECT_RISK_REPORT_PDF: true
     DETECT_RISK_REPORT_PDF_PATH: '.'
   with:
     scan-mode: 'RAPID'
     github-token: ${{ github.token }}
     detect-version: 7.9.0
     blackduck-url: 'https://my.blackduck.url.com'
     blackduck-api-token: ${{ secrets.BLACKDUCK_API_TOKEN }}
- name: Post Action
   if: ${{ always() }}
   shell: bash
   run: |
     echo ${{ steps.scan.outputs.detect-exit-code }}
     echo ${{ steps.scan.outputs.detect-exit-code-name }}