Basic support for overlay PR analysis #4447

Job	Run time
Config export (ubuntu-latest, linked)	59s
Config export (windows-latest, linked)	2m 47s
Config export (ubuntu-latest, nightly-latest)	1m 14s
Config export (macos-latest, linked)	1m 37s
Config export (macos-latest, nightly-latest)	1m 4s
Config export (windows-latest, nightly-latest)	3m 42s
	11m 23s

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