Make all errors on an unsupported platform `ConfigurationError`s #4620

Job	Run time
Diagnostic export (macos-latest, linked)	1m 36s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 25s
Diagnostic export (windows-latest, nightly-latest)	5m 27s
Diagnostic export (windows-latest, linked)	3m 16s
Diagnostic export (ubuntu-latest, linked)	1m 24s
Diagnostic export (macos-latest, nightly-latest)	1m 33s
	14m 41s

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