Blocks/refactor post galleries block processor #22866

Job	Run time
Core running from src / MacOS	3m 22s
Core running from build / Windows	4m 32s
Core running from src / Windows	5m 1s
Core running from src / Linux	2m 27s
Gutenberg running from src / MacOS	14m 5s
Core running from build / MacOS	3m 51s
Core running from build / Linux	2m 28s
Gutenberg running from build / MacOS	13m 27s
Gutenberg running from build / Windows	13m 28s
Gutenberg running from src / Linux	8m 48s
Gutenberg running from build / Linux	9m 2s
Gutenberg running from src / Windows	12m 58s
Slack Notifications	-1s
Failed workflow tasks	-1s
	1h 33m 27s

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