Improved E2E fixture caching in CI

[jonatansberg]

Summary

• caches the existing E2E DB snapshot and role auth state package in GitHub Actions
• restores cached snapshots into ghost_e2e_base on fresh CI runners before global setup validates/skips
• keeps Playwright global setup as the cache-miss seeding path

Stack

Stacked on #26562 / ber-3366-rework-e2e-fixtures.

Testing

• pnpm --filter @tryghost/e2e test:types
• pnpm --filter @tryghost/e2e lint
• parsed .github/workflows/ci.yml and compose.dev.yaml with Ruby YAML
• verified docker compose -f compose.dev.yaml config mysql includes the /mnt/e2e-cache bind mount

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (ber-3366-rework-e2e-fixtures@da6d40d). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                       @@
##             ber-3366-rework-e2e-fixtures   #28193   +/-   ##
===============================================================
  Coverage                                ?   73.87%           
===============================================================
  Files                                   ?     1530           
  Lines                                   ?   129809           
  Branches                                ?    15575           
===============================================================
  Hits                                    ?    95902           
  Misses                                  ?    32921           
  Partials                                ?      986           

Flag	Coverage Δ
admin-tests	54.17% <ø> (?)
e2e-tests	73.87% <ø> (?)

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