Basic support for overlay PR analysis #4333

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 4s
Diagnostic export (macos-latest, linked)	1m 23s
Diagnostic export (macos-latest, nightly-latest)	1m 5s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 7s
Diagnostic export (windows-latest, linked)	2m 51s
Diagnostic export (windows-latest, nightly-latest)	2m 49s
	10m 19s

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