chore: remove unused InvalidVote error

[marcellorigotti]

Pull Request

Closes: PRO-xxx

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests.
• I have written and tested required migrations.
• I have updated documentation where appropriate.

[kylezs]

For context, was made unused here: #5363

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71%. Comparing base (91b1a31) to head (c5a2bbc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5403    +/-   ##
======================================
- Coverage     72%     71%    -0%     
======================================
  Files        486     486            
  Lines      85996   85859   -137     
  Branches   85996   85859   -137     
======================================
- Hits       61543   61353   -190     
- Misses     21597   21647    +50     
- Partials    2856    2859     +3     

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