[Backport] Use votes score instead of total votes on debates and legislation proposals

[decabeza]

References

This is a backport of AyuntamientoMadrid#1835

Objectives

Use votes_score instead of total_votes on debates and legislation proposals.

The main change it's now the votes number is the result of cached_votes_up minus cached_votes_down.

BEFORE

1 cached_votes_up + 0 cached_votes_down = 1 vote
1 cached_votes_up + 1 cached_votes_down = 2 votes
0 cached_votes_up + 1 cached_votes_down = 1 vote

NOW

1 cached_votes_up + 0 cached_votes_down = 1 vote
1 cached_votes_up + 1 cached_votes_down = No votes
0 cached_votes_up + 1 cached_votes_down = -1 vote

So this PR:

• Replace total votes to cached_votes_score on debates: this show votes_score as result of votes_up minus votes_down.
• Add cached_votes_score to legislation proposals.
• Replace total votes to cached_votes_score on legislation proposals: this show votes_score as result of votes_up minus votes_down.
• Show cached_votes_score on admin legislation proposals.

Visual Changes

Voting debates

Voting legislation proposals

Legislation proposals admin show "Total supports" (cached_votes_score)

For release notes ⚠️

In case you have existing legislation proposals in DB run:
bin/rake legislation_proposals:calculate_cached_votes_score RAILS_ENV=production
to calculate cached_votes_score.