Cleanup extract to toolcache feature flag #4651

Job	Run time
Diagnostic export (macos-latest, linked)	1m 5s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 5s
Diagnostic export (windows-latest, linked)	3m 2s
Diagnostic export (windows-latest, nightly-latest)	3m 55s
Diagnostic export (ubuntu-latest, linked)	1m 5s
Diagnostic export (macos-latest, nightly-latest)	1m 6s
	11m 18s

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