Ensure artifacts are only uploaded in safe situations #3655

Job	Run time
Diagnostic export (macos-latest, linked)	1m 13s
Diagnostic export (macos-latest, nightly-latest)	1m 20s
Diagnostic export (windows-latest, nightly-latest)	2m 33s
Diagnostic export (ubuntu-latest, linked)	1m 2s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 7s
Diagnostic export (windows-latest, linked)	4m 22s
	11m 37s

Provide feedback