qt: show audio/video only playlist

fix #28055 (closed)

note that filtering may still yield results from any kind as there is no related parameter in medialibrary searchPlaylists API

changed milestone to %4.0

added Component::Interface: Qt label

added MRStatus::Reviewable label

added MRStatus::Accepted label and removed MRStatus::Reviewable label

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added 59 commits

• 692adf17...d109df24 - 56 commits from branch videolan:master
• 793acb3a - medialib: allow to list audio or video only playlists
• 0af016b1 - qt: allow filtering on video/audio only in MLPlaylistListModel
• d060da25 - qml: show video/audio playlists only in Video/Music > Playlists

Compare with previous version

enabled an automatic merge when the pipeline for d060da25 succeeds

merged