Add vote count per budget on budgets index in BO

Is your feature request related to a problem? Please describe.

As an administrator managing a participatory budget with a lot of budgets, I have to enter each budget to see the number of votes per budget.

Describe the solution you'd like

Add a vote column in the budgets index in BO to have an overview of the distribution of finished votes by budget.

Additional context

May be this could come with a harmonization of the budget index (with filtering and ordering capabilities).

Does this issue could impact on users private data?

No