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Co-authored-by: remitamine <remitamine@gmail.com>

[YoutubeDL] Raise syntax error for format selection expressions with multiple + operators (closes #27803)

Mixcloud IDs are generated as `username_slug` when the full ID dict has been
downloaded.  When downloading a list (e.g. uploads, favorites, ...), the temporary
ID is just the `slug`.  This made e.g. archive file usage require the download
of stream metadata before the download can be rejected as already downloaded.

This commit attempts to get the uploader username during the GraphQL query, so the
temporary IDs are generated similarly.

Closes #26963.

ubuntu-latest alias will be switched to ubuntu-20.04 soon (see [1]) which lacks python 3.3 and 3.4 (see [2]).

1. https://github.blog/changelog/2020-10-29-github-actions-ubuntu-latest-workflows-will-use-ubuntu-20-04/
2. https://raw.githubusercontent.com/actions/python-versions/main/versions-manifest.json

JSON objects with an empty "files" tag seem to be a valid PeerTube API
response. In those cases the "files" arrays contained in the
"streamingPlaylists" members can be used instead.
closes #26002
closes #27586

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closes #27698