Issue #3582703: Convert @FieldWidget annotations to PHP 8 attributes

Andy Gilesrequested to merge
issue/select_text_value-3582703:3582703-remaining-fixes-for into 2.x

Annotation-based plugin discovery is removed in Drupal 11. Convert all 4 FieldWidget plugins to use #[FieldWidget] PHP 8 attribute syntax. This is compatible with Drupal 10.2+ where attribute-based discovery was introduced.

Closes #3582703

Edited by Andy Giles

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