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Avoid prompting the user to install a missing package for meta MP4 tracks

Charles requested to merge charles05/totem:no-metadata-plugins into ubuntu/latest 
* Avoid prompting the user to install a missing package for meta MP4
    tracks. (LP: #2091302)
    - Has caused multiple cases of user confusion.
    - Bug in the legacy GStreamer playbin2 element. It reports to
      applications using it that their environment is missing a codec
      plugin for metadata tracks. However, there are no plugins that
      handle metadata tracks, so the user is sent on a wild-goose
      chase.
    - We're stuck with this behaviour for our supported Ubuntu
      releases. Fixing playbin2 and backporting that would be a risky
      change.
    - As a workaround, never enter the missing codec wizard for
      metadata tracks. They don't affect basic playback; they are
      typically vendor-specific things Totem will never get support
      for, like Apple's extension for describing the parallax of
      decoded stereoscopic video frames.
    - Upstream were not interested in maintaining support for the
      codec installation wizard anymore. They assume interested users
      will switch to their Flatpak version instead, which has no need
      for a codec installation wizard; since there, all necessary
      codecs and libraries are bundled with the application.

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