When bookmark exhaustion occurs during processing, return `false` instead of throwing an `Exception`. Developed in https://github.com/WordPress/wordpress-develop/pull/10616. Props jonsurrell, westonruter, dmsnell. Fixes #64394. Built from https://develop.svn.wordpress.org/trunk@61755 git-svn-id: http://core.svn.wordpress.org/trunk@61061 1a063a9b-81f0-0310-95a4-ce76da25c4cd