perf(trufflehog): single process for PR changed-file scan #670

Job	Run time
Check whether there are things to scan	5s
Run zizmor / job-workflow-ref	17s
Run zizmor / Generate and upload zizmor results 🌈	37s
Run zizmor / Send zizmor metrics to Prometheus via Grafana Bench	14s
	1m 13s

Provide feedback