Themes: Add an ID to the block theme skip link. #12904

Job	Run time
Core running from build / Core running from build / Linux	2m 15s
Core running from src / Core running from src / Linux	1m 59s
Core running from src / Core running from src / Windows	3m 48s
Core running from build / Core running from build / Windows	3m 24s
Core running from build / Core running from build / MacOS	1m 58s
Core running from src / Core running from src / MacOS	1m 54s
Gutenberg running from build / Gutenberg running from build / Linux	8m 43s
Gutenberg running from src / Gutenberg running from src / Linux	8m 42s
Gutenberg running from build / Gutenberg running from build / Windows	11m 58s
Gutenberg running from src / Gutenberg running from src / Windows	11m 39s
Gutenberg running from build / Gutenberg running from build / MacOS	8m 26s
Gutenberg running from src / Gutenberg running from src / MacOS	7m 48s
Slack Notifications / Prepare notifications	3s
Slack Notifications / Success notifications	3s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Failure notifications	0s
Failed workflow tasks	0s
	1h 12m 40s

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