UI: Enable WHIP service in UI

This provides the UI glue to enable the WHIP service introduced in the
obs-webrtc plugin.

Co-authored-by: John Bradley <jocbrad@twitch.tv>
Signed-off-by: pkv <pkv@obsproject.com>
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f