Delete abstain option

[selankon]

Abstain option and badge are not shown anymore.

Instead, if abstain is possible, you can just continue selecting only zero or n options.

A warning message will appear on confirmation modal.

Implemented on https://github.com/vocdoni/ui-scaffold/pull/648

If less options than max are chosen, it will add the abstain choices to the ballor

[selankon]

Based on the code of this PR, I don't understand what's going on with the abstain option anymore. I mean, I see we now accept sending empty results, but where are the changes for the mapping of these abstains when voting? Or aren't required anymore due to underlying SDK changes? 🤔

On the SDK anything changed. Now the flow is quite different, and if abstain is enabled the abstain options will be mapped here, during the ballot creation.

https://github.com/vocdoni/ui-components/blob/84cd1a303bd88551e4ed1bce67ca16d09c2f23a0/packages/chakra-components/src/components/Election/Questions.tsx#L89-L94

So for the user is transparent:

• If canAbstain is enabled, you can select less options than the minimum and advance.
• On the confirm modal on the ui scaffold a message will inform you about you are abstaining
• Then, when creating the ballot, it will check: if abstain is enabled and the selected choices are less than the maxCount, it will fill the ballot with necessary abstain choices.