Disable combining runs within a single file #4502

Job	Run time
Diagnostic export (macos-latest, nightly-latest)	2m 14s
Diagnostic export (windows-latest, nightly-latest)	3m 24s
Diagnostic export (macos-latest, linked)	1m 26s
Diagnostic export (windows-latest, linked)	2m 48s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 20s
Diagnostic export (ubuntu-latest, linked)	1m 4s
	12m 16s

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