Make all errors on an unsupported platform `ConfigurationError`s #4652

Job	Run time
Config export (windows-latest, linked)	3m 21s
Config export (macos-latest, nightly-latest)	1m 24s
Config export (ubuntu-latest, nightly-latest)	1m 31s
Config export (ubuntu-latest, linked)	1m 20s
Config export (macos-latest, linked)	1m 28s
Config export (windows-latest, nightly-latest)	3m 18s
	12m 22s

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