Add plugin template registration API #104009

Job	Run time
JavaScript Date Tests (Node.js 20)	41s
Compute previous WordPress version	2s
Build JavaScript assets for PHP unit tests	4m 53s
JavaScript Date Tests (Node.js 21)	47s
Mobile	4m 5s
PHP coding standards	16s
JavaScript (Node.js 20) 1/4	1m 56s
JavaScript (Node.js 20) 2/4	1m 42s
JavaScript (Node.js 20) 3/4	1m 55s
JavaScript (Node.js 20) 4/4	1m 36s
JavaScript (Node.js 21) 1/4	1m 39s
JavaScript (Node.js 21) 2/4	1m 55s
JavaScript (Node.js 21) 3/4	1m 39s
JavaScript (Node.js 21) 4/4	1m 32s
PHP ${{ matrix.php }}${{ ((matrix.multisite && ' multisite') \|\| '') }}${{ (((matrix.wordpress != '') && format(' (WP {0}) ', matrix.wordpress)) \|\| '') }} on ubuntu-latest	1s
PHP	1s
	24m 40s

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