Detect if poll is finalized and update UI

[JohnGuilding]

Currently, the frontend has an explicit button for finalising the poll. This can be called by anyone so it does not have proper access control, and it is bad UX. We will update the coordinator service to automatically listen for onchain events so it can finalise the poll without manual user input. After this change is made on the coordinator side, we should update the frontend to:

1. Remove finalize button
2. Automatically listening for finalisation and updating the UI once finalised
   2a. show helpful message/componenet informing the user about what is happening
   2b. show execute button once finalised

[kalidiagne]

For the first point should be already fixed by #54

I will double check once i take this one

[NicoSerranoP]

Closed because we have automatic poll finalization