This commit adds missing `void` return types to (parent) methods that can ''explicitly'' return `void` as one of their conditional paths.
Addressed methods:
* `WP_Privacy_Requests_Table::column_status()`
* `WP_Recovery_Mode::handle_error()`
* `WP_Widget::form()` — unlike the others, it's the ''child'' classes that return `void` when the method is correctly implemented.
Note: `@return void` (where `void` is the single type returned) should not be used outside the default bundled themes and the PHP compatibility shims included in WordPress Core, as per the [https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/ documentation standards].
Follow-up to [30382], [42967], [43256], [44973], [45448].
Props justlevine.
See #52217, #62281.
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