Tests: Add coverage for bookmark sanitization.
Cover field normalization, context-specific filters and escaping in sanitize_bookmark_field(). Test array and object inputs to sanitize_bookmark(), including preservation of unknown fields, omission of missing fields, and forwarding the bookmark ID and context to filters.
Developed in: https://github.com/WordPress/wordpress-develop/pull/14323
Props huzaifaalmesbah.
See #65819.
Javascript required