CI: Validate Flatpak with flatpak-builder-lint

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Validate the Flatpak manifest before building it; then, validate
the build directory; and when publishing, validate the repository
as well.

Using flatpak-builder-lint in the org.flatpak.Builder Flatpak in a
docker container seems to not work.

So the linter repo is cloned and Poetry is used to run it inside an
custom action.

"--exceptions" is required to allow the manifest to pass since
OBS Studio has one for "--talk-name=org.freedesktop.Flatpak".

Co-authored-by: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>

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