Fix assumption that download URLs contain file extension #3593

Job	Run time
Diagnostic export (macos-latest, linked)	1m 30s
Diagnostic export (windows-latest, linked)	3m 1s
Diagnostic export (ubuntu-latest, linked)	54s
Diagnostic export (macos-latest, nightly-latest)	1m 13s
Diagnostic export (windows-latest, nightly-latest)	2m 50s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 0s
	10m 28s

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