Overlay databases: use --overlay-changes #3937

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 7s
Diagnostic export (macos-latest, linked)	1m 33s
Diagnostic export (windows-latest, linked)	2m 42s
Diagnostic export (windows-latest, nightly-latest)	3m 34s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 2s
Diagnostic export (macos-latest, nightly-latest)	1m 9s
	11m 7s

Provide feedback