Multisite: Show upload space usage for a subsite #14488

Job	Run time
Core running from build / Core running from build / Linux	2m 15s
Core running from src / Core running from src / Linux	2m 8s
Core running from build / Core running from build / Windows	3m 49s
Core running from src / Core running from src / Windows	3m 51s
Core running from build / Core running from build / MacOS	2m 29s
Core running from src / Core running from src / MacOS	1m 45s
Gutenberg running from build / Gutenberg running from build / Linux	8m 57s
Gutenberg running from src / Gutenberg running from src / Linux	8m 48s
Gutenberg running from build / Gutenberg running from build / Windows	12m 29s
Gutenberg running from src / Gutenberg running from src / Windows	13m 16s
Gutenberg running from build / Gutenberg running from build / MacOS	11m 16s
Gutenberg running from src / Gutenberg running from src / MacOS	10m 48s
Slack Notifications	0s
Failed workflow tasks	0s
	1h 21m 51s

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