fix(tests): Improper skip_if_no_analytics_db marker behaviour

[khvn26]

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Changes

This renames the skip_if_no_analytics_db fixture to use_analytics_db and makes sure the markers are initialised in the correct order.

How did you test this code?

Ran the tests with and without the ANALYTICS_DATABASE_URL setting present.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 31, 2025 3:39pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jul 31, 2025 3:39pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jul 31, 2025 3:39pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5876	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-5876	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5876	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5876	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5876	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5876	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.82%. Comparing base (1411f54) to head (04ec8af).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5876   +/-   ##
=======================================
  Coverage   97.82%   97.82%           
=======================================
  Files        1258     1258           
  Lines       44745    44785   +40     
=======================================
+ Hits        43771    43811   +40     
  Misses        974      974           

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