Set `ArtifactV4Upgrade`'s default value to true #3342

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 30s
Diagnostic export (windows-latest, nightly-latest)	4m 10s
Diagnostic export (windows-latest, linked)	4m 11s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 17s
Diagnostic export (macos-latest, linked)	2m 5s
Diagnostic export (macos-latest, nightly-latest)	1m 57s
	15m 10s

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