Make all errors on an unsupported platform `ConfigurationError`s #4664

Job	Run time
Config export (windows-latest, linked)	5m 12s
Config export (ubuntu-latest, nightly-latest)	1m 24s
Config export (ubuntu-latest, linked)	1m 19s
Config export (macos-latest, nightly-latest)	1m 30s
Config export (macos-latest, linked)	1m 25s
Config export (windows-latest, nightly-latest)	3m 12s
	14m 2s

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