fix: allow identity overrides to be created for non-existent identities

[matthewelwell]

Changes

Updates the PUT request to create a new identity override for an edge identity to create the identity if it doesn't already exist.

How did you test this code?

Added an integration test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Feb 6, 2025 2:59pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Feb 6, 2025 2:59pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Feb 6, 2025 2:59pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5081	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5081	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5081	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5081	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5081	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-5081	Finished ✅	Skipped

[github-actions]

Uffizzi Preview deployment-60694 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.43%. Comparing base (895e5b8) to head (85f1937).
Report is 59 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5081   +/-   ##
=======================================
  Coverage   97.43%   97.43%           
=======================================
  Files        1214     1214           
  Lines       42277    42296   +19     
=======================================
+ Hits        41193    41213   +20     
+ Misses       1084     1083    -1     

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