fix: #3628580 Add video formatter configuration schema

Adds schema for both video formatters, inheriting the core formatter schemas, with a Kernel regression test.

Local testing: the regression test passes on Drupal 10.6.18 and fails without the schema. Schema validation also passes on Drupal 11.4.8 and Drupal 12.0.0-dev.

Issue: https://www.drupal.org/project/glightbox_media_video/issues/3628580

AI-Generated: Yes (Codex prepared the implementation and regression test.)

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