feat(CI): Upload e2e error videos to GitHub

[emyller]

Experiment made with Claude Sonnet 4.

[vercel]

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3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored	Preview		Sep 5, 2025 6:18pm
flagsmith-frontend-preview	Ignored	Preview		Sep 5, 2025 6:18pm
flagsmith-frontend-staging	Ignored	Preview		Sep 5, 2025 6:18pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6023	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6023	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6023	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6023	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6023	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.99%. Comparing base (4f67003) to head (67537cd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6023   +/-   ##
=======================================
  Coverage   97.99%   97.99%           
=======================================
  Files        1275     1275           
  Lines       44892    44892           
=======================================
  Hits        43993    43993           
  Misses        899      899           

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