Error when an (image) upload’s mime type is unsupported #14368

Job	Run time
Core running from build / Core running from build / Linux	2m 7s
Core running from src / Core running from src / Linux	2m 4s
Core running from build / Core running from build / Windows	3m 59s
Core running from src / Core running from src / Windows	4m 30s
Core running from build / Core running from build / MacOS	2m 7s
Core running from src / Core running from src / MacOS	1m 54s
Gutenberg running from build / Gutenberg running from build / Linux	8m 41s
Gutenberg running from src / Gutenberg running from src / Linux	9m 4s
Gutenberg running from build / Gutenberg running from build / Windows	11m 50s
Gutenberg running from src / Gutenberg running from src / Windows	12m 13s
Gutenberg running from build / Gutenberg running from build / MacOS	7m 2s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 27s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 12m 58s

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