Treat missing pack errors as configuration errors #4648

Job	Run time
Config export (macos-latest, linked)	1m 48s
Config export (ubuntu-latest, nightly-latest)	1m 27s
Config export (macos-latest, nightly-latest)	1m 40s
Config export (ubuntu-latest, linked)	1m 19s
Config export (windows-latest, nightly-latest)	3m 14s
Config export (windows-latest, linked)	3m 18s
	12m 46s

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