Let me add all the councillors for an authority in one contribution

[equivalentideas]

Currently on the person_contributes_councillor_info branch, people can add information for one councillor at a time.

They should be able to add details for all the councillors for an authority in one contribution.

Extracted from #1160

[equivalentideas]

Next step, @equivalentideas write test.

[equivalentideas]

Next step, @equivalentideas write test.

I've just changed the existing test in 8db2c84...1456991

This is an interesting bit that we could probably write a few more tests for as we define how it really works, but I this feels like the next most basic step.

As we spoke about last week @hisayohorie I image you might be adding a new CouncillorContribution model or something that connects a set of SuggestedCouncillors to the Contributor.

I think don't worry too much about validations and stuff yet, because we can describe the specific behavior we want in issues and then write tests and then add it. If you have ideas for that, go ahead and make those issues :) Again that form book will have useful advice for that.

[equivalentideas]

Since #1192 was merged, you can now make a contribution with as many councillors as you want which solves this issues. 🔨 Great work @hisayohorie ✨