Multisite: Show upload space usage for a subsite #14485

Job	Run time
Core running from build / Core running from build / Linux	2m 9s
Core running from src / Core running from src / Linux	2m 9s
Core running from build / Core running from build / Windows	3m 49s
Core running from src / Core running from src / Windows	3m 49s
Core running from build / Core running from build / MacOS	2m 10s
Core running from src / Core running from src / MacOS	2m 12s
Gutenberg running from build / Gutenberg running from build / Linux	3m 58s
Gutenberg running from src / Gutenberg running from src / Linux	3m 58s
Gutenberg running from build / Gutenberg running from build / Windows	3m 49s
Gutenberg running from src / Gutenberg running from src / Windows	3m 47s
Gutenberg running from build / Gutenberg running from build / MacOS	4m 2s
Gutenberg running from src / Gutenberg running from src / MacOS	4m 3s
Slack Notifications	1s
Failed workflow tasks	1s
	39m 57s

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