Multisite: Show upload space usage for a subsite #14481

Job	Run time
Core running from build / Core running from build / Linux	2m 9s
Core running from build / Core running from build / Windows	4m 1s
Core running from src / Core running from src / Linux	1m 57s
Core running from src / Core running from src / Windows	3m 57s
Core running from build / Core running from build / MacOS	2m 13s
Core running from src / Core running from src / MacOS	2m 42s
Gutenberg running from build / Gutenberg running from build / Linux	5m 25s
Gutenberg running from src / Gutenberg running from src / Linux	5m 24s
Gutenberg running from build / Gutenberg running from build / Windows	5m 11s
Gutenberg running from src / Gutenberg running from src / Windows	5m 9s
Gutenberg running from build / Gutenberg running from build / MacOS	5m 27s
Gutenberg running from src / Gutenberg running from src / MacOS	5m 23s
Slack Notifications	1s
Failed workflow tasks	1s
	49m 0s

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