fix(migration-test): add decorator to skip if not enabled

[gagantrivedi]

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Changes

Add skipif mark to skip migration test if not enabled

How did you test this code?

By running test to with migration tests disabled

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jan 21, 2025 10:46am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jan 21, 2025 10:46am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jan 21, 2025 10:46am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5024	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-5024	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5024	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5024	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5024	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5024	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-60092 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.40%. Comparing base (3557e14) to head (5bbaf6e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5024   +/-   ##
=======================================
  Coverage   97.40%   97.40%           
=======================================
  Files        1192     1192           
  Lines       41654    41657    +3     
=======================================
+ Hits        40571    40574    +3     
  Misses       1083     1083           

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