Blocks/refactor post galleries block processor #23878

Job	Run time
Core running from src / Linux	3m 9s
Core running from build / Linux	3m 25s
Core running from src / Windows	8m 23s
Core running from build / MacOS	8m 41s
Core running from src / MacOS	6m 30s
Core running from build / Windows	7m 9s
Slack Notifications	-1s
Failed workflow tasks	-1s
	37m 15s

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