Add loading indicator to combo box control author selector #124534

Job	Run time
Build JavaScript assets for PHP unit tests	2m 24s
Compute previous WordPress version	1s
Mobile	2m 24s
PHP coding standards	24s
JavaScript (Node.js 20) 1/4	2m 1s
JavaScript Date Tests (Node.js 20)	41s
JavaScript (Node.js 20) 2/4	1m 49s
JavaScript Date Tests (Node.js 22)	41s
JavaScript (Node.js 20) 3/4	1m 54s
JavaScript (Node.js 20) 4/4	1m 54s
JavaScript (Node.js 22) 1/4	1m 55s
JavaScript (Node.js 22) 2/4	1m 48s
JavaScript (Node.js 22) 3/4	1m 38s
JavaScript (Node.js 22) 4/4	1m 43s
PHP ${{ matrix.php }}${{ ((matrix.multisite && ' multisite') \|\| '') }}${{ (((matrix.wordpress != '') && format(' (WP {0}) ', matrix.wordpress)) \|\| '') }} on ubuntu-latest	1s
PHP	1s
	21m 19s

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