fix(migrations): project permission migration unique error

[matthewelwell]

Changes

The previous implementation of the migration was causing the unit tests to fail to run on my machine.

How did you test this code?

Ran the unit tests locally.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jan 30, 2025 3:42pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jan 30, 2025 3:42pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jan 30, 2025 3:42pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5061	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5061	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5061	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5061	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5061	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-60457 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.43%. Comparing base (b0d0a80) to head (554eb3a).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5061   +/-   ##
=======================================
  Coverage   97.43%   97.43%           
=======================================
  Files        1214     1214           
  Lines       42253    42253           
=======================================
  Hits        41169    41169           
  Misses       1084     1084           

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