Post PxLL: add confirmation modal

[selankon]

After the PxLl voting process, we should solve & improve some issues:

• [ ] When the Admin ends an election or cancel them, a confirmation modal must appear (only with the non-reversible actions).

Related to https://github.com/vocdoni/ui-components/issues/153 (because come from PxLL feedback)

[selankon]

After talk with @elboletaire we found that the ui-scaffold is not using the buttons to execute the actions of the chakra-ui components:

The chakra ui action button:

https://github.com/vocdoni/ui-components/blob/main/packages/react-providers/src/election/ActionsProvider.tsx#L51 https://github.com/vocdoni/ui-components/blob/main/packages/chakra-components/src/components/Election/Actions/Pause.tsx#L7

The ui scaffold action button:

https://github.com/vocdoni/ui-scaffold/blob/0988c92326ea3b0f4f5511f542ad3c15828c8857/src/components/Process/ActionsMenu.tsx#L48-L64

So the first thing is to try to implement the chakra-component button on the ui scaffold and then implement the confirmation modal here on the ui components.

Here an example of how to do it:

https://github.com/vocdoni/ui-components/blob/main/packages/chakra-components/src/components/Election/Questions.tsx#L36