Add MySQL 9.1, MariaDB 11.4, and other matrix adjustments #12678

Job	Run time
Core running from build / Core running from build / Linux	2m 10s
Core running from src / Core running from src / Linux	2m 7s
Core running from build / Core running from build / Windows	4m 12s
Core running from src / Core running from src / Windows	3m 40s
Core running from build / Core running from build / MacOS	1m 55s
Core running from src / Core running from src / MacOS	1m 48s
Gutenberg running from build / Gutenberg running from build / Linux	8m 14s
Gutenberg running from src / Gutenberg running from src / Linux	8m 50s
Gutenberg running from build / Gutenberg running from build / Windows	11m 12s
Gutenberg running from src / Gutenberg running from src / Windows	11m 17s
Gutenberg running from build / Gutenberg running from build / MacOS	9m 54s
Gutenberg running from src / Gutenberg running from src / MacOS	8m 18s
Slack Notifications	1s
Failed workflow tasks	1s
	1h 13m 39s

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