refactor(provisioning_api): consolidate user-edit field logic #28590

Job	Run time
changes	9s
Sharding - MySQL 8.4 (PHP 8.3) - database tests	7m 6s
Sharding - MySQL 9.7 (PHP 8.5) - database tests	7m 7s
phpunit-mysql-summary	6s
	14m 28s

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