feat(copilot): replace custom vote system with PostHog thumb survey

[jul-dan]

Summary

Issue: QOV-1793

Replace custom vote system with PostHog thumb survey with up/down vote and custom feedback when downvote

Testing

• Changes tested locally in the relevant Console's pages and Storybooks
• yarn test or yarn test -u (if you need to regenerate snapshots)
• yarn format
• yarn lint

PR Checklist

• I followed naming, styling, and TypeScript rules (see .cursor/rules)
• I performed a self-review (diff inspected, dead code removed)
• I titled the PR using Conventional Commits with a scope when possible (e.g. feat(service): add new Terraform service) - required for semantic-release
• I only kept necessary comments, written in English (watch for useless AI comments)
• I involved a designer to validate UI changes if I am not a designer
• I covered new business logic with tests (unit)
• I confirmed CI is green (Codecov red can be accepted)
• I reviewed and executed locally any AI-assisted code

[jul-dan]

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Below, a word from its wisdom :

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[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.73%. Comparing base (cb488d7) to head (984efbc).
⚠️ Report is 10 commits behind head on staging.

Files with missing lines	Patch %	Lines
...ilot-panel/assistant-message/assistant-message.tsx	60.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2574      +/-   ##
===========================================
+ Coverage    47.45%   47.73%   +0.28%     
===========================================
  Files         1231     1279      +48     
  Lines        23042    23883     +841     
  Branches      6849     7062     +213     
===========================================
+ Hits         10934    11401     +467     
- Misses       10045    10317     +272     
- Partials      2063     2165     +102     

Flag	Coverage Δ
unittests	47.73% <60.00%> (+0.28%)	⬆️

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[rmnbrd]

Could you just remove the old .patch file? Thx!

Except for that, LGTM 👍