Ensure reactions from the same user across multiple devices shows in the correct Tile #2739
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This problem occurs because we mapped raised hand and reactions based upon the user's user ID. However this isn't unique and so when a reaction is sent from one device, it appears on multiple tiles.
This refactors so we use membership event IDs instead, however this isn't working yet because I haven't found a way to ID the correct GridTile for the right user.
This is going to need #2701 to work so we can hook off the membership event ID correctly.