Make the Autobuilder log message referring to build modes clearer #3480

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 8s
Diagnostic export (macos-latest, linked)	1m 4s
Diagnostic export (windows-latest, linked)	3m 24s
Diagnostic export (ubuntu-latest, nightly-latest)	59s
Diagnostic export (macos-latest, nightly-latest)	1m 9s
Diagnostic export (windows-latest, nightly-latest)	4m 29s
	12m 13s

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