Overlay databases: use --overlay-changes #3945

Job	Run time
Diagnostic export (ubuntu-latest, nightly-latest)	1m 7s
Diagnostic export (windows-latest, nightly-latest)	4m 13s
Diagnostic export (macos-latest, linked)	1m 30s
Diagnostic export (ubuntu-latest, linked)	1m 8s
Diagnostic export (windows-latest, linked)	2m 38s
Diagnostic export (macos-latest, nightly-latest)	1m 23s
	11m 59s

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