Enable rebuilding PRs with conflicts #4635

Job	Run time
Diagnostic export (macos-latest, linked)	1m 57s
Diagnostic export (macos-latest, nightly-latest)	1m 23s
Diagnostic export (windows-latest, linked)	3m 26s
Diagnostic export (ubuntu-latest, linked)	1m 21s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 20s
Diagnostic export (windows-latest, nightly-latest)	3m 18s
	12m 45s

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