PR checks: support collections of workflows #4285

Job	Run time
Resolve environment (windows-latest, linked)	2m 9s
Resolve environment (windows-latest, default)	2m 26s
Resolve environment (macos-latest, default)	1m 55s
Resolve environment (ubuntu-latest, default)	38s
Resolve environment (windows-latest, nightly-latest)	2m 19s
Resolve environment (macos-latest, linked)	1m 42s
Resolve environment (ubuntu-latest, nightly-latest)	42s
Resolve environment (macos-latest, nightly-latest)	1m 51s
Resolve environment (ubuntu-latest, linked)	39s
	14m 21s

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