fix: #3608459 Replace the dead Vimeo video in the demo default content that fails media oEmbed validation on install
The demo default content references an external Vimeo video (https://vimeo.com/76979871) that has been deleted and now returns 404. Media oEmbed validation fetches the URL when the demo content is imported during drush site:install, so the dead URL fails the whole install with "The provided URL does not represent a valid oEmbed resource".
Points the two affected remote-video media entities at a stable, long-lived Vimeo video (The Mountain, https://vimeo.com/22439234, published 2011), keeping the demo's Vimeo-provider example (field_provider stays vimeo) while the install is no longer at the mercy of the deleted video.
Related issue: #3608459
This changeset was produced with AI assistance (Claude Code). Per the Drupal AI-generated contribution policy, it has been reviewed by a human before submission.
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