Disable combining runs within a single file #4500

Job	Run time
Diagnostic export (windows-latest, linked)	2m 3s
Diagnostic export (ubuntu-latest, linked)	1m 0s
Diagnostic export (macos-latest, linked)	1m 55s
Diagnostic export (windows-latest, nightly-latest)	3m 6s
Diagnostic export (macos-latest, nightly-latest)	1m 34s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 18s
	10m 56s

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