#41604 REST API: Add strict param validation to WP_REST_Settings_Controller:…

[PANawkar]

Adds validation to WP_REST_Settings_Controller::update_item() so unknown parameters or an empty request body return a 400 instead of a silent 200, with unit tests covering empty bodies, unknown/mixed params (POST and PUT), and confirming valid settings still succeed alongside internal params like _locale.

Trac ticket: https://core.trac.wordpress.org/ticket/41604

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