feat(trufflehog): exclude content/grafana/dashboards (user-supplied s… #725

Job	Run time
Check whether there are things to scan	5s
Run zizmor / job-workflow-ref	16s
Run zizmor / Generate and upload zizmor results 🌈	25s
Run zizmor / Send zizmor metrics to Prometheus via Grafana Bench	12s
	58s

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