Enable rebuilding PRs with conflicts #7350

Job	Run time
Packaging: Config and input (ubuntu-latest, default)	1m 32s
Packaging: Config and input (macos-latest, linked)	2m 29s
Packaging: Config and input (windows-latest, default)	3m 48s
Packaging: Config and input (macos-latest, default)	1m 50s
Packaging: Config and input (ubuntu-latest, linked)	1m 35s
Packaging: Config and input (ubuntu-latest, nightly-latest)	1m 56s
Packaging: Config and input (windows-latest, nightly-latest)	3m 23s
Packaging: Config and input (macos-latest, nightly-latest)	2m 51s
Packaging: Config and input (windows-latest, linked)	6m 6s
	25m 30s

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