Classify third-party upload `SyntaxError`s as configuration errors #1786

Job	Run time
Config export (ubuntu-latest, latest)	55s
Config export (macos-latest, latest)	3m 28s
Config export (windows-latest, latest)	5m 26s
Config export (ubuntu-latest, nightly-latest)	1m 20s
Config export (macos-latest, nightly-latest)	4m 13s
Config export (windows-latest, nightly-latest)	3m 8s
	18m 30s

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