Add defaultFontSizes theme.json (theme.json v3) #95200

Job	Run time
Compute previous WordPress version	1s
Mobile	4m 1s
JavaScript (Node.js 20)	4m 26s
PHP coding standards	26s
JavaScript (Node.js 21)	4m 12s
PHP 7.0 on ubuntu-latest	5m 44s
PHP 7.0 multisite on ubuntu-latest	5m 40s
PHP 7.1 on ubuntu-latest	5m 45s
PHP 7.1 multisite on ubuntu-latest	5m 52s
PHP 7.2 on ubuntu-latest	5m 50s
PHP 7.2 multisite on ubuntu-latest	5m 43s
PHP 7.3 on ubuntu-latest	5m 56s
PHP 7.3 multisite on ubuntu-latest	5m 55s
PHP 7.4 on ubuntu-latest	5m 56s
PHP 7.4 multisite on ubuntu-latest	5m 40s
PHP 8.0 on ubuntu-latest	5m 44s
PHP 8.0 multisite on ubuntu-latest	5m 47s
PHP 8.1 on ubuntu-latest	5m 45s
PHP 8.1 multisite on ubuntu-latest	5m 58s
PHP 8.2 on ubuntu-latest	5m 41s
PHP 8.2 multisite on ubuntu-latest	5m 57s
PHP 7.0 (WP 6.3.2) on ubuntu-latest	5m 45s
PHP 7.4 (WP 6.3.2) on ubuntu-latest	5m 44s
PHP 8.2 (WP 6.3.2) on ubuntu-latest	5m 44s
PHP	1s
	2h 3m 13s

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