feat: take into account hideAbstain when computing results

[wa0x6e]

Summary

Closes: https://github.com/snapshot-labs/workflow/issues/380

This PR uses the hideAbstain property in the space settings, when computing results.

When hideAbstain is enabled, abstain in basic voting is ignored from the quorum and results

// when hide_abstain = false
total_score = for_score + against_score + abstain_score

// when hide_abstain = true
total_score = for_score + against_score 

How to test

1. Go to a space with hideAbstain enabled: http://localhost:8080/#/s:safe.eth/proposal/0x5cf64434792565591b005460db0460e9314753178d4aa5475dfc0ce4d45638a2
2. The results should exclude abstain choice from the results list, and quorum should not take abstain scores into account. Results should be same as v1 https://v1.snapshot.box/#/safe.eth/proposal/0x5cf64434792565591b005460db0460e9314753178d4aa5475dfc0ce4d45638a2

Notes

Excluding ABSTAIN from all scores results in lower quorum, and is marking a proposal that have passed before this PR as rejected (see the example proposal above)

Since the hide_abstain option can change proposal outcome depending on its setting, it should not be a global option, and each proposal should have its own local copy (like privacy)