Feat: Slack Payload Tweaks

[AaronMT]

Block-kit Builder: link
Current payload example:

{
    "attachments": [
        {
            "color": "${{ env.JOB_STATUS_COLOR }}",
            "blocks": [
                {
                    "type": "header",
                    "text": {
                        "type": "plain_text",
                        "text": ":looker: Looker Github Action :github: - ${{ env.WORKFLOW_NAME }}",
                        "emoji": true
                    }
                },
                {
                    "type": "divider"
                },
                {
                    "type": "section",
                    "text": {
                        "type": "mrkdwn",
                        "text": "Status: ${{ env.JOB_STATUS }}\n Logs: <${{ env.JOB_LOG_URL }}|Build Logs>\n Branch: ${{ env.BRANCH }}"
                    }
                },
                {
                    "type": "divider"
                },
                {
                    "type": "context",
                    "elements": [
                        {
                            "type": "mrkdwn",
                            "text": ":testops-notify: created by <https://mozilla-hub.atlassian.net/wiki/spaces/MTE/overview#Test-Operations|Mobile Test Engineering>"
                        }
                    ]
                }
            ]
        }
    ]
}

@rpappalax's initial suggestion:

PROD comes from the workflow names, so they can be renamed no problem