feat(CI): Upload e2e error videos to GitHub

[emyller]

Experiment made with Claude Sonnet 4.

This is an attempt to improve our CI debugging workflow by moving e2e failure videos and/or screenshots as artifacts to each pull request. As of the creation of this issue, the team relies on a Slack channel that receives e2e video artifacts.

[vercel[bot]]

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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[bot]]

Docker builds report

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

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 97.99%. Comparing base (4f67003) to head (67537cd). :warning: 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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[emyller]

At a glance, I don't know yet why Claude's approach didn't work. We'll wait to prioritize this correctly and maybe fit within a sprint.