Some WebRTC implementations such as Pion are unhappy if the
profile-level-id isn't returned with a compatible profile as the
RFC requires. Let's try to reform it
In practice, the correct way to do this would be to not use caps
intersection, but to instead implement the correct RFC compliant
SDP O/A negotiation of formats.
Include a unit test written by Philippe Normand
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9031>
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