Remove YouTube videos in library cause "No matching provider found."

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to our policies.

Enhanced User Interface:

// Example detection in MediaSource plugin
if ($this->getMetadata($media, 'status') === 'video_not_found') {
  $message = $this->t('The YouTube video "%title" has been removed.', [
    '%title' => $media->label()
  ]);
}

Error Detection Layer:

// In MediaSource plugin
try {
  // Attempt to fetch video metadata
} catch (ClientErrorResponseException $e) {
  if ($e->getResponse()->getStatusCode() === 404) {
    // Video removed case
    return new VideoRemovedException($media->label());
  }
}

Here is the implementation and its tests: https://git.drupalcode.org/search?search=No%20matching%20provider%20foun...

Suggestion implemented in MR, please review. Is it fine to place the variable in the Exception or do we need any kind of escaping? (I don't think so). Without these details, the message will not be helpful to show in any way (in my opinion).

Seems like a good improvement for qualify of life, and debugging