Automation: Label pull requests based on author org (#32547)
Automation: Label pull requests based on author org (#32547)

Should add the label pr/external to pull requests for authors not member 
of the Grafana org.
Making use of grafana/grafana-github-actions#20
grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana