Don't prepare the response body for HEAD requests #12980

Job	Run time
Core running from build / Core running from build / Linux	2m 19s
Core running from src / Core running from src / Linux	2m 3s
Core running from build / Core running from build / Windows	4m 8s
Core running from src / Core running from src / Windows	4m 3s
Core running from build / Core running from build / MacOS	2m 2s
Core running from src / Core running from src / MacOS	1m 41s
Gutenberg running from build / Gutenberg running from build / Linux	8m 42s
Gutenberg running from src / Gutenberg running from src / Linux	8m 29s
Gutenberg running from build / Gutenberg running from build / Windows	11m 55s
Gutenberg running from src / Gutenberg running from src / Windows	11m 45s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 36s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 19s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 2s

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