Fix a case where wp_rand is undefined. #76768

Job	Run time
Determine tests matrix	6s
Check plugin monorepo dep versions	39s
Storybook tests	3m 20s
Static analysis	8m 45s
PHP tests: PHP 7.2 WP latest	7m 35s
PHP tests: PHP 7.3 WP latest	7m 12s
PHP tests: PHP 7.4 WP latest	7m 38s
PHP tests: PHP 8.0 WP latest	7m 38s
PHP tests: PHP 8.1 WP latest	8m 13s
PHP tests: PHP 8.2 WP latest	8m 39s
PHP tests: PHP 8.3 WP latest	6m 50s
PHP tests: PHP 7.0 WP previous	8m 16s
PHP tests: PHP 8.2 WP previous	4m 39s
PHP tests: PHP 8.2 WP trunk	7m 21s
PHP tests: PHP 7.4 WP latest with WooCommerce	3m 20s
PHP tests: PHP 8.1 WP latest with wpcomsh	7m 57s
JS tests	4m 31s
	1h 42m 39s

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