Make all errors on an unsupported platform `ConfigurationError`s #4663

Job	Run time
Config export (ubuntu-latest, linked)	1m 19s
Config export (macos-latest, linked)	2m 5s
Config export (macos-latest, nightly-latest)	2m 15s
Config export (ubuntu-latest, nightly-latest)	1m 20s
Config export (windows-latest, linked)	3m 43s
Config export (windows-latest, nightly-latest)	3m 7s
	13m 49s

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