Add DevTools self-update workflow #743

Job	Run time
Resolve PHP Version	4s
Cleanup Orphaned Pull Request Previews	0s
Cleanup Pull Request Preview	0s
Generate Reports	53s
Summarize Reports Workflow	8s
Verify Pull Request Reports Preview	-1s
Verify Main Reports Deployment	-1s
Comment Pull Request Preview URLs	0s
	1m 3s

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