Unit tests for governance tallying

[plaidfinch]

The Tally::evaluate function in the governance component has not been comprehensively tested, and @avahowell and I observed a confusing and unexpected proposal vote failure (when it should have passed). This function should be exhaustively tested very carefully.

[erwanor]

Moving back to Next because we're using the 53 column for items we are definitely trying to land, on a schedule.

[hdevalence]

Blocked on #3588