HUD Invite button: fixes by calling Web Share API directly #6510
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The in-world Invite button is currently broken, because it emits the "action_invite" event, but the handler is removed along with the rest of the 2-D UI, when entering immersive mode.
As the user can always copy the Invite URL/Room URL when in 2-D mode, I'm assuming the in-world Invite button should be a quick shortcut. Therefore, I have wired it up to call the Web Share API directly. This reduces the friction of inviting someone to join you when in immersive mode in a headset, thus advancing our goal of making it easy for multiple people to join one instance.
Tested on a Quest 3.
This PR is dependent on #6508