PR checks: support collections of workflows #4708

Job	Run time
Diagnostic export (ubuntu-latest, nightly-latest)	1m 11s
Diagnostic export (macos-latest, nightly-latest)	1m 8s
Diagnostic export (ubuntu-latest, linked)	1m 9s
Diagnostic export (windows-latest, linked)	2m 44s
Diagnostic export (windows-latest, nightly-latest)	2m 43s
Diagnostic export (macos-latest, linked)	1m 23s
	10m 18s

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