drupal/entity_embed is a composer level dependency instead of a drupal level dependency at entity_browser.info.yml

---

Problem/Motivation

The `entity_embed` module is not acknowledged as a dependency in `entity_browser.info.yml` at the Drupal level.

Steps to reproduce

1. Install `entity_browser` via Composer.
2. Use features in `entity_browser` that depend on `entity_embed`.
3. Note no system-level dependency acknowledgment.

Proposed resolution

Declare `entity_embed` as a dependency in `entity_browser.info.yml` to ensure system-level recognition in Drupal.

Remaining tasks

- Add `entity_embed` to `entity_browser.info.yml`.
- Update documentation to reflect changes.
- Test dependency acknowledgment in Drupal.

User interface changes

No user interface changes; this is a back-end dependency configuration update.

API changes

No API changes, but proper dependency declaration ensures stable functionality across related modules.

Data model changes

No data model changes are required for this update as it is purely dependency configuration.