Add a “waitForTransition” data API #123828

Job	Run time
Build JavaScript assets for PHP unit tests	4m 46s
Compute previous WordPress version	1s
Mobile	4m 18s
PHP coding standards	28s
JavaScript Date Tests (Node.js 20)	38s
JavaScript (Node.js 20) 1/4	2m 1s
JavaScript Date Tests (Node.js 22)	41s
JavaScript (Node.js 20) 2/4	1m 48s
JavaScript (Node.js 20) 3/4	1m 42s
JavaScript (Node.js 20) 4/4	1m 54s
JavaScript (Node.js 22) 1/4	1m 57s
JavaScript (Node.js 22) 2/4	1m 54s
JavaScript (Node.js 22) 3/4	1m 38s
JavaScript (Node.js 22) 4/4	1m 49s
PHP ${{ matrix.php }}${{ ((matrix.multisite && ' multisite') \|\| '') }}${{ (((matrix.wordpress != '') && format(' (WP {0}) ', matrix.wordpress)) \|\| '') }} on ubuntu-latest	1s
PHP	1s
	25m 37s

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