Don't prepare the response body for HEAD requests #12981

Job	Run time
Core running from build / Core running from build / Linux	2m 27s
Core running from src / Core running from src / Linux	2m 2s
Core running from build / Core running from build / Windows	4m 5s
Core running from src / Core running from src / Windows	4m 0s
Core running from build / Core running from build / MacOS	1m 51s
Core running from src / Core running from src / MacOS	1m 45s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 27s
Gutenberg running from src / Gutenberg running from src / MacOS	10m 16s
Gutenberg running from build / Gutenberg running from build / Linux	8m 34s
Gutenberg running from src / Gutenberg running from src / Linux	8m 34s
Gutenberg running from src / Gutenberg running from src / Windows	11m 23s
Gutenberg running from build / Gutenberg running from build / Windows	11m 13s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 14m 37s

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