Basic support for overlay PR analysis #4405

Job	Run time
Diagnostic export (macos-latest, nightly-latest)	1m 22s
Diagnostic export (macos-latest, linked)	1m 9s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 5s
Diagnostic export (windows-latest, nightly-latest)	3m 22s
Diagnostic export (ubuntu-latest, linked)	59s
Diagnostic export (windows-latest, linked)	2m 43s
	10m 40s

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