Warn about small amounts of MB, not GB #3833

Job	Run time
Diagnostic export (macos-latest, linked)	1m 14s
Diagnostic export (ubuntu-latest, linked)	1m 2s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 4s
Diagnostic export (macos-latest, nightly-latest)	1m 5s
Diagnostic export (windows-latest, linked)	3m 52s
Diagnostic export (windows-latest, nightly-latest)	3m 52s
Diagnostic export (ubuntu-latest, linked)	1m 2s
Diagnostic export (macos-latest, linked)	1m 14s
Diagnostic export (macos-latest, nightly-latest)	1m 7s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 4s
Diagnostic export (windows-latest, nightly-latest)	3m 52s
Diagnostic export (windows-latest, linked)	3m 52s
	24m 20s

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