PR checks: support collections of workflows #4697

Job	Run time
Diagnostic export (windows-latest, nightly-latest)	4m 38s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 12s
Diagnostic export (ubuntu-latest, linked)	1m 6s
Diagnostic export (windows-latest, linked)	3m 15s
Diagnostic export (macos-latest, linked)	1m 25s
Diagnostic export (macos-latest, nightly-latest)	1m 5s
	12m 41s

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