Propagates error from is_proposal_accepted

[grarco]

Describe your changes

Closes #3238.

I've reviewed the code for our native vps and removed the wrong calls to unwrap_or_default applied to results (those on options are fine).

⚠️ WARNING ⚠️
Pay attention to merging this PR cause it carries breaking changes that span multiple vps, including especially the governance one: so even in the context of the multi-stage deployment of mainnet this could cause problems.

Checklist before merging

• If this PR has some consensus breaking changes, I added the corresponding breaking:: labels
  • This will require 2 reviewers to approve the changes

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 61.18%. Comparing base (2256e38) to head (6db4ceb).
Report is 10 commits behind head on main.

Files	Patch %	Lines
crates/governance/src/vp/pgf.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3700   +/-   ##
=======================================
  Coverage   61.17%   61.18%           
=======================================
  Files         315      315           
  Lines      103187   103183    -4     
=======================================
+ Hits        63129    63131    +2     
+ Misses      40058    40052    -6     

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[sug0]

nice! thanks