Rich text: remove preserveWhiteSpace serialisation differences #88117

Job	Run time
Compute previous WordPress version	3s
Mobile	7m 32s
PHP coding standards	27s
JavaScript (16)	10m 5s
PHP 7.0 on ubuntu-latest	4m 54s
PHP 7.0 multisite on ubuntu-latest	6m 37s
PHP 7.1 on ubuntu-latest	5m 19s
PHP 7.1 multisite on ubuntu-latest	5m 0s
PHP 7.2 on ubuntu-latest	6m 34s
PHP 7.2 multisite on ubuntu-latest	9m 33s
PHP 7.3 on ubuntu-latest	4m 55s
PHP 7.3 multisite on ubuntu-latest	5m 22s
PHP 7.4 on ubuntu-latest	5m 15s
PHP 7.4 multisite on ubuntu-latest	6m 36s
PHP 8.0 on ubuntu-latest	5m 20s
PHP 8.0 multisite on ubuntu-latest	9m 36s
PHP 8.1 on ubuntu-latest	4m 55s
PHP 8.1 multisite on ubuntu-latest	7m 12s
PHP 8.2 on ubuntu-latest	5m 4s
PHP 8.2 multisite on ubuntu-latest	6m 55s
PHP 7.0 (WP 6.3.2) on ubuntu-latest	9m 59s
PHP 7.4 (WP 6.3.2) on ubuntu-latest	4m 57s
PHP 8.2 (WP 6.3.2) on ubuntu-latest	4m 56s
PHP	3s
	2h 17m 9s

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