Make all errors on an unsupported platform `ConfigurationError`s #4675

Job	Run time
Config export (ubuntu-latest, linked)	1m 17s
Config export (windows-latest, nightly-latest)	4m 9s
Config export (macos-latest, linked)	2m 9s
Config export (macos-latest, nightly-latest)	2m 10s
Config export (ubuntu-latest, nightly-latest)	1m 20s
Config export (windows-latest, linked)	3m 1s
	14m 6s

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