Script Loader: Move `wp_load_classic_theme_block_styles_on_demand()` … #27340

Job	Run time
Core running from build / MacOS	1m 14s
Core running from src / Windows	3m 3s
Core running from build / Windows	2m 47s
Core running from src / MacOS	1m 16s
Core running from build / Linux	1m 40s
Core running from src / Linux	1m 32s
Slack Notifications / Prepare notifications	4s
Slack Notifications / Success notifications	3s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Failed workflow tasks	0s
	11m 39s

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